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.


When you use an S/MIME certificate that contains the value of for the Any Purpose object identifier (also known as OID) in the Enhanced Key Usage (EKU) attribute, the certificate is considered invalid and is not included in the Offline Address Book (OAB). Therefore, the OAB is not generated as expected.


To resolve this issue, install the following update:

2961522 Update Rollup 7 for Exchange Server 2010 Service Pack 3


To work around this issue, use a certificate that contains the value of for the Secure Email object identifier in the EKU attribute.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about EKU, go to the following Microsoft website:

How certificates work

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!