Wednesday, March 12, 2014

Files and Settings guide for Outlook

How this guide works

In the “Folder locations” section, you’ll find an overview of the folders Outlook uses to store files in or read files from. Aside from its location a short description is provided and a list of files types which are stored in that specific folder. These folder names are also referenced in the “File names” section.
The “File names” and “Registry locations” include a “Migrate?” column to inform about the possibilities to move to another computer or user profile in the following way;
  • possible
  • not needed (automatically recreated)
  • not recommended (dependencies)
  • not possible
Not recommended
This means that the single file could hold dependencies on other settings, making it not usable after the migration or could break something else. It could also mean that the file holds data or settings which is automatically recreated after the migration and therefore not required to migrate.
If you want to move these files, it is recommended that you use a backup/restore tool that supports migrating these settings by also copying or taking out certain dependencies. 
Restoring it on the same computer for the same user is basically always possible unless otherwise specified.
Required Windows View settings
To be able to view all files, folders and file extensions, you might need to make 3 changes first in;
Control Panel-> Folder Options-> tab View
  • Show hidden files and folders (selected)
  • Hide extensions for known file types (disabled)
  • Hide protected operating system files (disabled; only needed to see contents of the Protect folder)
After finishing this guide, it is recommended to turn the above options back to their original settings.

Folder locations

Unless otherwise specified, no advise is given to migrate the entire folder to another machine because of its mixed contents. Look at the list of individual files to determine if you can move the contents of the folder as a whole or not.
Name and example filesDescription contents and Locations
Main installation folder
  • *.exe
  • *.dll
  • other installation files
Installation files and folders.
For the main part this folders consists out of *.exe and *.dll files.
32-bit Windows:
C:\Program Files\Microsoft Office\Office\
64-bit Windows:
C:\Program Files (x86)\Microsoft Office\Office\
Shared installation folder
  • *.exe
  • *.dll
  • other installation files
Additional installation files and folders which are often shared between Office applications or other applications.
For the main part this folders consists out of *.exe and *.dll files.
32-bit Windows:
C:\Program Files\Common Files\Microsoft Shared\
64-bit Windows:
C:\Program Files (x86)\Common Files\Microsoft Shared\
Roaming Profile settings
  • .nk2
  • .srs
  • .xml
  • outcmd.dat
  • OutlPrnt
  • VbaProject.OTM
  • *.pab
Contains files and settings of the user which are being synced back to the server when Roaming Profiles is enabled in a domain.
Windows XP:
C:\Documents and Settings\%username%\Application Data\Microsoft\Outlook\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Roaming\Microsoft\Outlook\
Local Profile settings
  • .sharing.xml.obi
  • .xml.kfl
  • *.pst
  • *.ost
  • *.nst
  • *.oab
  • extend.dat
Contains files and settings of the user which are not being synced back to the server when Roaming Profiles in enabled in a domain.
Windows XP:
C:\Documents and Settings\%username%\Local Settings\Application Data\Microsoft\Outlook\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Local\Microsoft\Outlook\
RoamCache
  • Stream_Autocomplete_*.dat
  • Stream_AvailabilityOptions_*.dat
  • Stream_Calendar_*.dat
  • Stream_CategoryList_*.dat
  • Stream_ContactPrefs_*.dat
  • Stream_ConversationPrefs_*.dat
  • Stream_Weather_*.dat
Contains an extracted cache of (list) properties and settings which are stored within the mailbox itself.
Windows XP:
C:\Documents and Settings\%username%\Local Settings\Application Data\Microsoft\Outlook\RoamCache\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Local\Microsoft\Outlook\RoamCache\
Forms Roaming
  • outlook.box
  • RefEdit.exd
Contains files with settings for the Form Designer in Outlook.
Other (Office) applications can also use this location to store their own form design settings and data.
Windows XP:
C:\Documents and Settings\%username%\Application Data\Microsoft\Forms\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Roaming\Microsoft\Forms\
Forms Local Cache
  • FRMCACHE.DAT
Here are forms cached which are not native or local to the Outlook environment. Usually these are custom forms from Public Folders.
This folder holds a subfolder for each cached form. These folders are named after the message class and have a tmp-file within that folder.
Windows XP:
C:\Documents and Settings\%username%\Local Settings\Application Data\Microsoft\FORMS\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Local\Microsoft\FORMS\
Protect
  • Encrypted data
Folder with system files holding encrypted information.
The folder is named after the Security ID (SID) of the user.
It is used by Outlook 2003 and later and replaces the Protected Storage registry key.
It is not possible to migrate this folder but removing this folder can solve mail account password issues on Windows 8, Windows 7 and Windows Vista.
Windows XP:
C:\Documents and Settings\%username%\Application Data\Microsoft\Protect\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Roaming\Microsoft\Protect\
Signatures
  • *.htm
  • *.txt
  • *.rtf
Your signatures are being stored here in 3 formats;
HTML, Plain Text and Rich Text
The folder could hold additional data for your signature such as CSS, themes and images. 
Windows XP:
C:\Documents and Settings\%username%\Application Data\Microsoft\Signatures\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Roaming\Microsoft\Signatures
Templates
  • normal.dot
  • normalemail.dotm
Default folder to store templates in. This folder is shared with other Office applications and could hold additional files.
Windows XP:
C:\Documents and Settings\%username%\Application Data\Microsoft\Templates\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Roaming\Microsoft\Templates
Stationery
  • *.htm
  • *.jpg
  • *.gif
  • other image formats
Contains files used for personal stationery.
Windows XP:
C:\Documents and Settings\%username%\Application Data\Microsoft\Stationery\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Roaming\Microsoft\Stationery\
Proof
  • custom.dic
Holds additional personal dictionaries in the ANSI format (Outlook 2003 and previous).
Windows XP:
C:\Documents and Settings\%username%\Application Data\Microsoft\Proof\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Roaming\Microsoft\Proof\
UProof
  • custom.dic
Holds additional personal dictionaries in the UNICODE format (since Outlook 2007)
Windows XP:
C:\Documents and Settings\%username%\Application Data\Microsoft\UProof\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Roaming\Microsoft\UProof\
Local Office Settings
  • *.qat
  • *officeUI
Holds various local Office settings including your customizations to the Quick Access Toolbars and Ribbons in Outlook.
For an overview of qat-files used by Outlook 2007 see this post. Outlook 2010 and Outlook 2013 use officeUI-files instead.
Windows XP:
C:\Documents and Settings\%username%\Local Settings\Application Data\Microsoft\Office\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Local\Microsoft\Office\
Roaming Office Settings
  • *.acl
Holds various roaming Office settings which are being synced back to the server when Roaming Profiles is enabled in a domain. Plain Text AutoCorrect entries created via Outlook are kept here as well.
Windows XP:
C:\Documents and Settings\%username%\Application Data\Microsoft\Office\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Roaming\Microsoft\Office\
Secure Temp (OLK)
  • any file format
This is the Temp folder for Outlook where it stores files to when they are directly opened from within Outlook instead of being saved to disk first by the user.
The folder name is variable and its exact location is exposed in the registry.
Windows XP:
C:\Documents and Settings\%username%\Local Settings\Application Data\Microsoft\Windows\Temporary Internet Files\\
Windows 8, Windows 7 and Windows Vista:
C:\Users\%username%\AppData\Local\Microsoft\Windows\Temporary Internet Files\\

File Names

 refers to name of the profile you have configured for Outlook. By default this is either "Outlook" or "Microsoft Outlook Internet Settings".
NameDescription contents and LocationsMigrate?
*.pstPersonal Message Store
Main data file for Outlook containing all you Mail, Calendar, Contacts, Tasks, Notes and Journal items. In addition to that it can contain "hidden" data or settings such as Views, Rules, Categories (since Outlook 2007), per folder AutoArchive settings, etc…
By default the first pst-file is called outlook.pst. When you have AutoArchive enabled, you'll have a file called archive.pst as well.
If you connect to a SharePoint List, then you'll also have a file called "SharePoint Lists.pst". IMAP accounts also uses this file format to cache their data in.
Additional automatically created pst-files are appended with a number e.g.; outlook0,pst, outlook1.pst, archive0.pst, etc…
You can create additional pst-files if you want and can place them in a different location but network locations are not supported.
Corruption of the main pst-file can prevent Outlook from loadingcorrectly and could also lead to data loss. Therefore you should backup these files on a regular basis.
Possible
Location: Local Profile Settings
*.ostOffline Message Store
Similar to a pst-file but represents an offline cache of an on-line mailbox intended to enable offline access and to reduce network traffic or to increase Outlook performance when using a slow connection. These files were originally used only to cache an Exchange mailbox but the Outlook Connector also uses this file format to cache Live Hotmail mailboxes.
By default the file is called outlook.ost when connecting to Exchange and .ost when created by the Outlook Connector e.g.; yourname_hotmail.ost or yourname_live.ost.
Additional automatically created ost-files are appended with a number e.g.; outlook0.ost, outlook1.ost
As it is merely a cache and the actual data remains on the server, there is no need to backup this file. When it gets corrupted it an prevent Outlook from loading correctly but as long as you still have access to the Exchange server you can recover by renaming it to .old. Upon deletion (or renaming) it will be automatically recreated when you connect to the mail server again.
Not needed
Location: Local Profile Settings
*.nstNotes Message Store
Similar to an ost-file but then used for an offline cache for use by Lotus Notes Connector accounts. It may also be used by other connector type accounts. Older versions of the Outlook Connector for instance also have used this file format.
Not needed
Location: Local Profile Settings
*.pst.tmpA temporary file indicating a file lock on or queued data to be written to the similarly named pst-file.Not needed
Location: Local Profile Settings
*.ost.tmpA temporary file indicating a file lock on or queued data to be written to the similarly named ost-file.Not needed
Location: Local Profile Settings
*.oabOffline Address Book files for Exchange accounts.
It consist out of 6 files all containing different information or indexes about the users in the corporate global address book (GAL). Similar to the ost-file it is designed for offline usage, reducing network traffic and optimizing responsiveness when working on a slow connection.
Not needed
Location: Local Profile Settings
*.oftOutlook Form Template
Templates and custom forms are stored in the oft-format when saved outside of Outlook.
You should make a backup of these files and you can also migrate them for use on another computer.
Possible
Location: Templates
*.xnkExchange Shortcuts
These files represent shortcut links to folders accessible within Outlook. They are similar to computer shortcuts (lnk-files) which point to other files on the computer.
Since Outlook 2007 the file format is no longer registered for direct execution but that can be enabled again.
You can migrate these files to another computer or even share them (when they link to a Public Folder for instance) but of course that location should also be available on the other computer.
Possible
Location: Folder of choice
*.pabThis is the Personal Address Book file.
Previous versions of Outlook allowed you to store your contacts in a pab-file if you didn't use the Contact folder. The main reason for having a pab-file was that the Contacts folder in Outlook 97/98 didn't support personal distribution lists. This feature was added in Outlook 2000. In Outlook XP/2002 a pab-file was no longer created or linked by default but could be manually added. Since Outlook 2007 you can only directly import pab-files into your Contacts folder.
If you still use pab-files for some reason, you should either back it up or import them into the Contacts folder and stop using them completely.
Possible/
not needed
Location: Roaming Profile Settings
*.rwzOutlook Rules Wizard
This file format can store your rules that you have configured in Outlook. Since Outlook XP/2002, rules are stored within the mailbox itself instead of a separate file. You can still create a backup of your rules in the rwz-format and import them.
You can make a backup of this file for local use when you still use Outlook 2000 or previous but due to in-file dependencies you shouldn't attempt to migrate this file.
Not possible/
not needed
Location: Roaming Profile Settings
*.qatContains the Quick Access Toolbar (QAT) configuration information for Outlook 2007. There are up to 19 qat-files for Outlook 2007. Possible
Location: Local Profile Settings
*.officeUIContains the Quick Access Toolbar (QAT) and Ribbon configuration information for Outlook 2010 and Outlook 2010. There are up to 20 qat-files for Outlook 2010 and Outlook 2013. Possible
Location: Local Profile Settings
*.msgOutlook uses the msg-format to store messages and other mailbox items outside of Outlook without losing the Outlook interface when you open them from outside of Outlook. Any attachments that the message holds are also contained within this file. This allows you to open individual items on another computer on which Outlook is installed. Note that msg-files created in the Unicode format cannot be opened in Outlook XP/2002 or previous.Possible
Location: Folder of Choice
*.htm
*.txt
*.rtf
Outlook uses these "well known formats" to store the signatures in or to store Outlook messages in a format which can be used by other applications as well.
In case of the signatures, additional files and folders can be created in the signatures folder to save formatting information or pictures which have been used in the signature.
When saving a message in this format, attachments will not be saved with it.
Possible
Location: Signatures
Location: Folder of choice (when saving messages)
*.mlogLog file created by the Outlook Connector mainly for use of handling meeting requests correctly.
This file is automatically created or recreated when missing upon starting Outlook.
Not needed
Location: Local Profile Settings
*.otm
vbaproject.otm
Outlook VBA Module
Contains your configured macros and VBA programs created in the Visual Basic Editor. The default first project is stored in a file vbaproject.otm. If you have any macros configured, it is highly recommended to make a backup of this file or document your code elsewhere. You can also migrate these files to another computer.
Possible
Location: Roaming Profile Settings
outcmd.datOutlook Commands
This file contains the command bar and menu customizations that you make in Outlook. is corrupted, it can prevent Outlook from loading correctly.
You can make a backup of this file for local use but due to dependencies of installed addins, it is not recommended to migrate this file between computers. It is worth a shot to try it though as in case you run into issues, you simply rename the file to outcmd.old to reset.
Not recommended
Location: Roaming Profile Settings
extend.datThis file contains information and settings for registered Exchange Client Extensions (ECE).
When it is corrupted, it can prevent Outlook from loading correctly.
There is no need to make a backup of this file. Upon deletion it is automatically recreated from registry information. You shouldn't migrate this file between computers as there is no need to do so since it is recreated from information on the local computer. When migrating, you'll likely end up corrupting the configuration.
Not needed
Local: Local Profile Settings
views.datContains view settings for displaying of the folders.
This file is used by Outlook XP/2002 and previous and no longer used by later versions of Outlook as since Outlook 2003 this information is contained in the mailbox or pst-file.
You can make a backup of this file for local use when you still use Outlook XP/2002 or previous but due to in-file dependencies you shouldn't attempt to migrate this file.
Not possible
Location: Roaming Profile Settings
frmcache.datForms Cache
A cache file holding information about the cached custom forms in the local Forms folder. If it gets corrupted, custom forms might prevent from loading, display older versions of the form or my cause other unexpected results. Recovering can be achieved by clearing the folder which can be done in several ways.
Not needed
Location: Forms Local Cache
Normail.dotNormal.dot is the default file Word 2003 and previous use to store settings such as formatting styles, AutoText, custom toolbars and macros.
When you use Word as your email editor, in Outlook 2003 or previous, then this file gets loaded as well. It is also used when you have Word set as your default HTML editor and use the "Advanced Editor" to create a signature.
If the normal.dot file gets corrupted or if certain addins or ActiveX components are installed in Word, this will affect Outlook's behavior as well. Resetting the normal.dot file can be done by renaming it to .old.
This file should be backed up if you made custom changes and the file can be migrated between machines although certain addin dependencies can prevent it from working correctly.
Possible
Location: Templates
NormalEmail.dotmNormalEmail.dotm is similar to the normal.dot file and has been introduced in Outlook 2007 to support the new email editor and to break the dependencies with Word and to offer Outlook specific support. Quick Parts information is also stored in this file.
This file should be backed up if you made custom changes and the file can be migrated between machines.
Possible
Location: Templates
custom.dicThis file contains the words which you add to the dictionary via the spell check options. Since Outlook 2007 it is stored in the Unicode format and its location changed from the Proof folder to the UProof folder.
This is a shared file between other Office applications. The file can be edited via the spell check options in the Office applications that use it or directly via Notepad.
This file should be backed up if you made custom changes and the file can be migrated between machines.
Possible
Location: Proof (Outlook 2003 and previous)
Location: UProof (Since Outlook 2007)
MSO####.aclPlain Text AutoCorrect entries are store in this file. The #### is replace with the localized language ID number for the language it applies to. For instance, the English version is named MSO1033.acl, the Dutch version MSO1043.acl and the German version MSO1031.acl. You can find an overview of the numbers here. You need to look in the "LCID Dec" column for the correct number.
This is a shared file between other Office applications. The file can be edited via the AutoCorrect options in the Office applications.
This file should be backed up if you made custom changes and the file can be migrated between machines.
Possible
Location: Roaming Office Settings
offitems.log
outitems.log
These files contain items that have been added to the Journal or should still be added to the Journal.
When all the latest changes have been committed to the mailbox, then you can safely remove these files without losing data.
The file outitems.log tracks Outlook items that have been created during the last Outlook session and the file offitems.log tracks documents created by other Office applications which have been committed to Outlook during the last Outlook session or should still be committed when Outlook is closed.
Not needed
Location: Roaming Profile Settings
RefEdit.exdA cache of used form controls to speed up inserting the control again at a later time.Not needed
Location: Forms Roaming
outlook.boxContains settings for the custom Toolbox when designing a form.Not recommended
Location: Forms Roaming
.nk2Outlook AutoSuggest file (sometimes also named "AutoComplete file" or "nickname cache")
This file is used in Outlook 2002/XP, Outlook 2003 and Outlook 2007 to cache up to 1000 addresses that have been used before to address an email, meeting request, task request, etc…
This file holds no relation to the Contacts folder and shouldn't be relied on to securely save contact information as it is only a cache. You should really use the Contacts folder for that.
If you like to keep the cached information, you can migrate this file between machines as long as you rename the file after the name of the mail profile and the version of Outlook is the same. However, corruption of the file could break the mail profile or vice versa. In that case the mail profile should be recreated.
Possible
Location: Roaming Profile Settings
.nickSame as above but then used in Outlook 2000.Possible
Location: Roaming Profile Settings
.favThis file is used in Outlook 2002/XP and previous to hold the configured shortcuts (Favorites) in the Outlook Bar for the corresponding mail profile. The Outlook Bar has been replaced by the Navigation Pane in Outlook 2003 and later (see ).Possible
Location: Roaming Profile Settings
.srsThis file holds the send/receive settings for the corresponding mail profile.
You can make a backup of this file for local use but due to in-file dependencies you shouldn't attempt to migrate this file.
Not possible
Location: Roaming Profile Settings
.xmlThis file holds customization settings for the Navigation Pane in Outlook 2003 and later. Most notable settings are, Favorite Folders, Shortcuts from the Shortcuts Navigation and opened shared folder lists in the Calendar, Contacts, Tasks and Notes and Journal Navigation.
A corruption of the file can lead to loss of these configuration settings, being unable to remove certain folders or wrong folders showing up in the described sections.
You can make a backup of this file for local use but due to in-file dependencies you shouldn't attempt to migrate this file.
Not possible
Location: Roaming Profile Settings
.sharing.xml.obi
~last~.sharing.xml.obi
Contains information about the last sync process of (shared) services subscriptions such as RSS feeds, Exchange, SharePoint and Internet Calendar.
~last~.sharing.xml.obi contains the latest sync information of RSS feeds with Internet Explorer (Common Feed List).
Not needed
Location: Local Profile Settings
.xml.kflKnown Feed List.
This files contains information about which RSS feeds the specified Outlook mail profile syncs with the Common Feed List feature of Internet Explorer.
Not needed
Location: Local Profile Settings
OutlPrntThis file contains the print style settings.
When it gets corrupted or if it becomes very large (in general, even with a lot of custom printing styles, this file shouldn't be larger than a couple of hundred KB in size), you could run into printing errors. Rename it or delete it to recover.
Possible
Location: Roaming Profile Settings

Registry locations

 refers to the version number of Outlook which is installed.
NameContents and LocationMigrate
Main Outlook settings (user)Most settings for options you can set in Outlook are saved here.
Some keys will refer to folder paths on the local machine or contain other local data such as the machine name. When you filter out these keys, then you can migrate this registry hive to another machine.
Possible
(once filtered)
HKEY_CURRENT_USER\Software\Microsoft\Office\\Outlook\
Generic Office settings (user)Additional Outlook settings and generic Office settings are stored here.
The settings Outlook save here usually depend on components from other or generic Office applications. As long as you heavily filter this registry hive, then you can migrate the remaining settings. Due to the limited amount of valuable Outlook settings which are stored here, it's not recommended to spend your time migrating this key unless you'll need it for other Office applications as well.
Possible
(once filtered)/
Not recommended
HKEY_CURRENT_USER\Software\Microsoft\Office\\Common\
Registered addins (user)Installed addins which allow themselves to be enabled/disabled on a per user basis are exposed here.
Since these keys are created when the addins are installed, there is no need to migrate this key.
Not needed
HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\AddIns\
Registered Exchange Client Extensions (user)Sometimes created by mistake on Windows Vista by a custom ECE. This key should be removed then.Not needed
HKEY_CURRENT_USER\Software\Microsoft\Office\\Outlook\Exchange Client Extension\
Mail Profile settingsConfigured mail profiles are stored here.
These keys have a very high interrelation with each other and heavily depend on exact file locations on the local machine. Due to this, small errors in this registry hive could lead to a fully non-functional Outlook until the mail profile is recreated.
While you can make a backup of this registry hive for local use, due to the reasons above and because of most settings in this hive are stored in hexadecimal values, it is not recommended to try to migrate the mail profiles to another machine. For this, it is recommended to use a backup application suitable for mail profile migration or manually recreate it.
Not recommended/
Not possible
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\
Outlook 97 – 2000 in IMO use:
HKEY_CURRENT_USER\Software\Microsoft\Windows Messaging Subsystem\Profiles\
Protected StorageThis key is used by Outlook to store the passwords for mail profiles on Windows XP.
Windows Vista and later do not support this old method anymore for read/write use anduses a newer mechanism which is supported by Outlook 2003 and later.
Migrating this key is not possible but removing this key can solve account password issueson Windows XP.
Not possible
Windows XP: HKEY_CURRENT_USER\Software\Microsoft\Protected Storage System Provider\
Last logon settings for ExchangeThe last settings used to logon to an Exchange Server are stored here. It is used to pre-fill some dialogs like the username for the login dialog and caches some other settings.
There is no need to backup this hive or migrate it to another machine but it can come in handy in certain scenarios to pre-write the LogonDomain and UserName registry key to increase first-use experience for end-users.
Not needed
HKEY_CURRENT_USER\Software\Microsoft\Exchange\
Main Outlook settings (computer)System wide Outlook settings are stored here although you are likely to find only component registrations.
Since all of the options are system wide, these settings are not directly exposed to the end-user via the Outlook interface so it is very unlikely that any changes have been applied to this hive after installation. Therefore, there is no need to migrate this hive. In case there is a specific need for it, you'll have to filter the registry hive first from unneeded keys.
Not needed
32-bit Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\\Outlook\
64-bit Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\\Outlook\
Generic Outlook settings (computer)This key is similar to the "Main Outlook Settings (computer)" but then for shared Office components.
Similar to that hive, you'll find no need to migrate this.
Not needed
32-bit Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Common\
64-bit Windows:HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\Common\
Registered addins (computer)Similar to "Registered Addins (user)" but then for installed addins which allow themselves only to be enabled/disabled on a system wide basis by an administrator.
Since these keys are created when the addins are installed, there is no need to migrate this key.
Not needed
32-bit Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins\
64-bit Windows:HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\Outlook\Addins\
On a 64-bit Windows version, additional settings can be found in the 32-bit Windows location as well
Form RegionsSimilar to the "Registered addins (computer)" but then for Form Regions.
Only when you are developing Form regions for yourself and have manually added the keys, then it would be recommended to make a backup of the hive. In all other cases, it will be recreated automatically when you reinstall or reregister the Form Region.
Not needed
32-bit Windows:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\FormRegions\
64-bit Windows:HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\Outlook\FormRegions\
Generic properties for Exchange accountsSeveral generic Exchange provider settings and options are stored here.
Unless you made any explicit changes to it yourself, there is no need to migrate this hive. If you did make changes here, then only migrate the settings that you have actually changed. The hive is small enough to go through it manually.
Not recommended/ Not needed
32-bit Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\
64-bit Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Exchange\
Registered Exchange Client Extensions (computer)Installed Exchange Client Extensions have made themselves known here to Outlook.
As these keys are automatically created by the installed ECE, there is no need to migrate this hive.
Not needed
32-bit Windows:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Client\Extensions\
64-bit Windows:HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Exchange\Client\Extensions\

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