I noticed OAB related issue after migration from Ex2007 to EX2010 in one AD site. Migrated users were not able to download Offline Address Book. Downloading process failed with error:
Task ‘email@example.com’ reported error (0x801901B8) : ‘The operation failed.’
Exchange related cmdlets:
Get-WebServicesVirtualDirectory Get-OabVirtualDirectory Get-OfflineAddressBook Set-WebServicesVirtualDirectory Set-OabVirtualDirectory Set-OfflineAddressBook
Outlook check (check from end-user point of view):
- Test Email Auto Configuration (Autodiscover + Web sevices)
When I tried to open OAB xml (https://mail.ficility.net/OAB/f050e98b-46d4-46d5-a094-3d7b4f001b8f/oab.xml) in web browser by test account, the owa was opened instead of xml file. Due to this reason IIS configuration needed to be checked.
Problem was caused by enabled http redirect on the OAB virtual directory in IIS configuration.
Related article: Troubleshooting Offline Address Book Issues in Exchange 2010
Solution: To solve this problem simply clear the http redirect on CAS servers + iisreset /noforce (Use the /noforce parameter to help prevent data loss in case the IIS services cannot be stopped within the one minute time-out period. If you are certain that it is safe to force IIS to restart, you can omit the /noforce parameter. However, be aware that you could lose data if you do not include this parameter.).
Other useful links:
- Understanding Offline Address Books
- The Offline Address Book (Part 1-4)
- Cannot download Offline Address Book. 500 – Internal Server Error and other
- Move the Offline Address Book Generation Process to Another Server
- Simplify the Outlook Web App URL