Sign in with Microsoft
Sign in or create an account.
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.


If an Offline Address Book (OAB) Generation Request is sent before the completion of OAB generation, and if the OabProcessingThreshold value is exceeded (the default value is 0 minutes for Exchange On-Premises), the OAB generation process restarts. After you install Microsoft Exchange Server Cumulative Update 13 (CU13), the default value is changed to six hours.


To fix this issue, install Cumulative Update 13 or a later cumulative update for Exchange Server 2019.

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Was this information helpful?

What affected your experience?
By pressing submit, your feedback will be used to improve Microsoft products and services. Your IT admin will be able to collect this data. Privacy Statement.

Thank you for your feedback!