When Was The Last Exchange 2013 Oab Update?

When yous have Cached Exchange Manner enabled, Outlook by will by default cache the primary Global Address List as well. This is called the Offline Accost Volume and is beingness generated on the Exchange server.

Due to various syncing schedules, it tin take up to 24 hours before you could actually see a change in Outlook after a modification has been made in the Exchange organization or in Agile Directory.

In this guide, the relevant timings are explained and instructions are given in how you can directly strength an update and resync, which can be very handy when troubleshooting or when you piece of work in an Commutation environment which sees a lot of user mailbox mutations.

The automatic sync and update schedules
Updating Outlook manually
Modify the OAB update frequency in Outlook
Modify the OAB download behavior in Outlook
Location of the cached oab-files
Modify default OAB generation schedule in Exchange
Forcefulness OAB update on Exchange
More than about the Offline Address Volume

The automated sync and update schedules

Afterward a change has been made to any of the Accost Book attributes, that is also included in the Offline Address Book (OAB), the following occurs:

Exchange generates the OAB.
Default generation schedule: 8 hours.
Outlook downloads the OAB.
Default update schedule when leaving Outlook running: 24 hours.

This means that in the worst possible scenario, an update to the Address Book won't become available to the user until 24 hours subsequently the change.

Notation: It is not 32 hours since at least ii OAB generation cycles exist between 2 Outlook automatic sync cycles.

Updating Outlook manually

Even though Outlook is the last in the chain, information technology is ofttimes the beginning level where the troubleshooting takes identify as unremarkably this is where the request is coming from. And since this website'due south master focus is on Outlook, it makes sense to starting time with Outlook as well ;-).

And so once you know that the OAB must accept been updated (at maximum 8 hours subsequently the change), y'all can manually update the OAB instead of waiting 24 hours for Outlook to do information technology automatically.

The control for the manual update procedure tin can be constitute here:

Send/Receive-> Send/Receive Groups-> Download Address Book…

Outlook will automatically download updates just unless the size of the changes is larger than 12.v% (i-eighth) of the full OAB size. In that case the whole OAB is being downloaded again. In a subsequently section, it is explained how to modify this.

You can manually update your OAB rather than wait 24 hours.
Y'all tin manually update your OAB rather than wait 24 hours.

Note: Restarting Outlook will also trigger an OAB update once updating the mailbox cache has completed.

Modify the OAB update frequency in Outlook

You lot tin't modify the automated OAB update frequency of Outlook. Even when you modify the Transport/Receive Settings, enable the "Download offline accost book" option and configure the Send/Receive Group to sync every hr, the OAB will not be updated more than oft.

The just thing that you can control with this option is selecting which OAB to download; In the rare case that multiple has been assigned to you. In that example, Outlook automatically picks the one that contains the most addresses.

For completeness, you can find that choice in the following location;

Open the Send/Receive Groups dialog
- Keyboard shortcut: CTRL+ALT+S
- Ship/Receive-> Transport/Receive Groups-> Define Send/Receive Groups
- File-> Options-> Advanced-> Ship/Receive…
Select the "All Accounts" group and click the Edit… push.
Select your Exchange account and enable the choice: Include the selected account in this group.
Disable all the options in the "Business relationship Options" section except for: Download offline address book.
Clicking on the Accost Book Settings… allows you to select which OAB to sync.

Send/Receive Group Settings - Enable the opton to include the Exchange account and select to download the offline address book
Include your account in the new Send/Receive group and set it to only download the OAB.

Modify the OAB download beliefs in Outlook

At that place are diverse Registry settings available to control or modify the update and download beliefs of the Offline Accost Book in Outlook.

These Registry values usually do not exist notwithstanding within your Registry so you lot'll demand to create them first. For more info see: Editing the Registry.

Use Buried Substitution Mode but without OAB

To always piece of work with the Online Accost Book, even when you have Buried Substitution Mode enabled, you can set the post-obit Registry key and value.

Primal: HKEY_CURRENT_USER\Software\Microsoft\Office\<version>\Outlook\Cached Mode
Value name: DownloadOAB
Value type: REG_DWORD
Value: 0

Afterward setting this value, delete all your currently cached Offline Address Books.

Tip!
Another manner to await at the online Address Volume without disabling the OAB is by opening the Address Book (CTRL+SHIFT+B) and utilize the Accost Book dropdown list to set information technology to All Address Lists-> All Users or any other object type such equally All Contacts, All Groups or All Rooms.

Full OAB download threshold

To modify the threshold at which Outlook will download the total OAB rather than the incremental update, you can set up the following Registry value

Primal: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Substitution Provider
Value name: OAB Dif Divisor
Value type: REG_DWORD

As the value, set at which relative size a full OAB download should accept place rather than an incremental update. For instance, setting the value to 4 volition trigger a total download when the incremental update is larger than one-fourth the size of the full OAB. When the value is set to 0, Outlook will use xvi to foreclose a "divide by 0" error. If the key name doesn't exist, Outlook uses a value of 8.

Prompt earlier for full download

As the OAB tin be quite big in some environments, information technology could be wise to be prompted when Outlook wants to download the full OAB. This allows you to abort the update process when you are for example on a deadening or expensive connectedness.

Cardinal: HKEY_CURRENT_USER\Software\Microsoft\Commutation\Exchange Provider
Value name: Let Total OAB Prompt
Value blazon: REG_DWORD
Value: ane

Outlook is about to download a full version of the Offline Address Book. Would you like to continue?
You can get prompted if yous sometimes desire to prevent a full OAB download.

Location of the cached oab-files

Rather than forcing an OAB update via the Outlook interface, y'all can also manually delete them when Outlook is airtight.

By default, the relevant files are located here;

C:\Users\%username%\AppData\Local\Microsoft\Outlook\Offline Address Books\

You can paste the path mentioned above in the Address Bar of Explorer to quickly open the location.
Yous can paste the path mentioned above in the Address Bar of Explorer to quickly open the location.

Equally Outlook can connect to multiple Exchange servers in a single post profile, there is an additional subdirectory for each Exchange business relationship. Each folder is named with a GUID, referencing to the Exchange account, which incorporate the actual oab-files.

In case y'all take multiple GUID folders and want to figure out the right 1, see the next department.

In each GUID binder you'll find the following 6 oab-files in this location which make up the full Offline Accost Book:

uanrdex.oab	Ambiguous names alphabetize
ubrowse.oab	Main alphabetize
udetails.oab	Contains all the published details
updndex.oab	Index with changes to domain names and its lists
urdndex.oab	Relative distinguished names index
utmplsts.oab	Template strings for OAB dialog boxes

With Outlook closed, simply rename the folder containing the oab-files to .sometime to reset the local Offline Address Book.

Tip!
A benefit of manually deleting the oab-file is that earlier they are being re-downloaded, you are working with the Online Address Volume. When you lot find things working correctly for you at present merely not anymore after the oab-files were redownloaded, you lot know that the issue is with the oab-files on the server and non on the customer or the Accost Book configuration in general.

Decide which GUID folder your Accost Book downloads to

In case you have multiple GUID binder and want to observe out which GUID folder your OAB downloads to;

Open the Address Book in Outlook (keyboard shortcut CTRL+SHIFT+B).
In the Address Book dropdown listing, select the Offline Global Address Listing.
Right click on the dropdown field and choose Properties.
In the dialog that opens, click in the "The current server is:" field and move your cursor all the mode to the right (or printing the End button on your keyboard).

Modify default OAB generation schedule in Exchange

When making a change to a post recipient (like the email address or the display name of the user) or even update the parameters of an Offline Address Book on the Exchange server via Exchange Management Shell (PowerShell), updating the Outlook customer afterward that will not directly get you a fully up-to-date copy.

By default. generating the OAB is done by a System Mailbox on a schedule and changing this schedule depends on your Exchange version.

To find out which mailbox(es) tin can generate OABs within your organization use;

Get-Mailbox -Arbitration -Filter "PersistedCapabilities -eq 'OrganizationCapabilityOABGen'"

By default, this is only; SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}

Exchange 2013

To modify the OAB generation schedule in Exchange 2013, utilise the Set-MailboxServer cmdlet with the –OABGeneratorWorkCycle and –OABGeneratorWorkcycleCheckPoint parameter.

Yous'll demand to run this command on each of the mailbox servers which are or could be (especially when using a DAG) hosting an OAB Mailbox.

Example:
To set the OAB generation frequency to every 4 hours on a server called Exch1 use:
Set-MailboxServer Exch1 -OABGeneratorWorkCycle 01.00:00:00 -OABGeneratorWorkCycleCheckpoint 04:00:00

More info: Managing OAB in Exchange Server 2013 – Microsoft Tech Customs

Exchange 2016 and Exchange 2019

Changing the OAB generation schedule in Commutation 2016 and Exchange 2019 is a 2-step process.

Create a setting override via the New-SettingOverride cmdlet.
Apply the setting override via the Get-ExchangeDiagnosticInfo cmdlet.

Case:
To create the setting override to set the OAB generation frequency to every iv hours for all Exchange servers utilize:
New-SettingOverride -Name "OAB Generation Override" -Component TimeBasedAssistants -Department OABGeneratorAssistant -Parameters @("WorkCycle=02:00:00") -Reason "Generate OAB every 2 hours"

To apply this override to all servers use:
Get-ExchangeDiagnosticInfo -Process Microsoft.Commutation.Directory.TopologyService -Component VariantConfiguration -Argument Refresh

More info: Modify the offline address volume generation schedule in Substitution | Microsoft Docs

Exchange Online

The OAB is generated every 8 hours. You lot tin can't modify this schedule nor manually force an update.

Force OAB update on Exchange

Rather than changing the default schedule, you can also force an update of the Offline Address Book when using Exchange On-Bounds. This is peachy for testing or when information technology is important that changes are published immediately.

You tin employ the Update-OfflineAddressBook PowerShell control in the Exchange Management Shell to update an OAB:
Update-OfflineAddressBook -Identity "<name of the OAB>"

Case:
Update-OfflineAddressBook -Identity "Default Offline Address Book"

Notation: Users must still update the OAB manually or wait an Outlook OAB sync interval to see the changes.

More about the Offline Accost Book

Properly managing and troubleshooting the Offline Accost Book can exist quite complex. The higher up examples on how to alter the generation schedule and strength an update only just scratches the surface.

Below are some interesting articles to learn more than;

Administering the offline address book in Outlook | Microsoft Back up
Offline address books in Substitution Online | Microsoft Docs
Offline address books in Substitution Server | Microsoft Docs
Set-OfflineAddressBook (ExchangePowerShell) | Microsoft Docs
OAB in Exchange Server 2013 | Microsoft Tech Community
Introduces the alter from the System Attendant service to the OABGeneratorAssistant generating the OAB. This method is however beingness used in Substitution 2016 and Exchange 2019 although some details have changed (see farther links below).
OAB Improvements in Commutation 2013 Cumulative Update 5 | Microsoft Tech Community
OAB Improvements in Exchange 2013 Cumulative Update 7 | Microsoft Tech Customs
Introduces the concept of Shadow Distribution of the OAB.
The case of constant OAB generation and full OAB downloads | Microsoft Tech Community
Change the offline address book generation schedule in Exchange | Microsoft Docs
Applies to Exchange 2016 and Exchange 2019.
Managing OAB in Exchange Server 2013 | Microsoft Tech Community
Also includes info to change the offline accost book generation schedule.