Multiple users have an invalid static forwarding URI. Badly formatted forwarding URIs have been found for at least %1 different ...

Multiple users have an invalid static forwarding URI.

Badly formatted forwarding URIs have been found for at least %1 different contacts. This message will not be repeated again for %2 hours even though the problem may persist.
Cause: A faulty script or tool may have been used to set Active Directory attributes.
Resolution:
Correct or remove the value from Active Directory.