A customer removed their Lync Edge Server from the local domain (following best practices - it was in the domain before but they knew theis was wrong). When they did, everything worked fine, but there is a warning every hour about truing to validate the service account:
Active Directory operation failed while verifying validity of service account password
Active Directory operation failed with error code: 0x80070005 (Access is denied. ) Cause: The service account may not have required privileges to access Active Directory. Resolution: Check domain controller/global catalog server connectivity and whether the service account has sufficient privileges to access the Active Directory. If the problem persists, contact Product Support Services.
I am not sure what service account is being referred to here as Lync runs everything under Network Service (unlike OCS before it).
EDIT: We tore down the Lync components via bootstrapper /scorch and put everything back, and we are STILL seeing the problem. We'd rather not have to rebuild the machine from bare metal.