The WhatIf switch simulates the actions of the command. You can use this switch to view the changes that would occur without actually applying those changes. To see the input types that this cmdlet accepts, see Cmdlet Input and Output Types.
If the Input Type field for a cmdlet is blank, the cmdlet doesn't accept input data. To see the return types, which are also known as output types, that this cmdlet accepts, see Cmdlet Input and Output Types. If the Output Type field is blank, the cmdlet doesn't return data. Skip to main content.
This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. The following information in the GAL might not be available in the offline address book:. Custom properties that are added by a server administrator, such as the employee ID of each employee. Outlook must be able to access Exchange to obtain this information. Therefore, if you are working in Cached Exchange Mode and if you are working online — that is, your connection status is Connected to Microsoft Exchange — Outlook uses both the offline address book and the GAL to provide a complete listing of user information.
If you are in Cached Exchange Mode and your connection status is Disconnected , Trying to Connect , or Offline , you can see only the information that is in the offline address book. Note: If you're using Cached Exchange Mode, we recommend that you download the full details of the offline address book. This reduces the number of times the Outlook window might become unresponsive and the number of unnecessary connections to the Microsoft Windows Server Active Directory.
If Outlook is left running constantly in Cached Exchange Mode, it automatically updates the offline address book about one time per day depending on updates on the computer that is running Exchange. The offline address book size can vary from several megabytes to hundreds of megabytes in uncompressed form. The following factors can affect the size of the offline address book:.
The usage of security certificates in your organization. They are the single largest contributor to the size of the offline address book. The information that your organization has added to Windows Server Active Directory Domain Services for each user and each distribution group. For example, some organizations populate the address properties for each user. You can paste the path mentioned above in the Address Bar of Explorer to quickly open the location.
As Outlook can connect to multiple Exchange servers in a single mail profile, there is an additional subdirectory for each Exchange account. Each folder is named with a GUID, referencing to the Exchange account, which contain the actual oab-files. In case you have multiple GUID folders and want to figure out the correct one, see the next section.
With Outlook closed, simply rename the folder containing the oab-files to. A benefit of manually deleting the oab-file is that before they are being re-downloaded, you are working with the Online Address Book. When you find things working correctly for you now but not anymore after the oab-files were redownloaded, you know that the issue is with the oab-files on the server and not on the client or the Address Book configuration in general. When making a change to a mail 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 client after that will not directly get you a fully up-to-date copy.
By default. More info: Change the offline address book generation schedule in Exchange Microsoft Docs. Rather than changing the default schedule, you can also force an update of the Offline Address Book when using Exchange On-Premises. This is great for testing or when it is important that changes are published immediately. Properly managing and troubleshooting the Offline Address Book can be quite complex. The above examples on how to modify the generation schedule and force an update only just scratches the surface.
Default generation schedule: 8 hours. Outlook downloads the OAB. Default update schedule when leaving Outlook running: 24 hours. Updating Outlook manually Even though Outlook is the last in the chain, it is often the first level where the troubleshooting takes place as usually this is where the request is coming from.
Select your Exchange account and enable the option: Include the selected account in this group.
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