If you have problems with the communicator reports that address book can’t be synchronized or that it can’t expand a distribution list (error with distribution group service) you could check several stuffs, including if there is any errors in event log on the Front End server. Also check the certificate on the server isn’t expired. If the certificate has been changed recently also check on the IIS web site that the certificate has been changed to the new certificate.
I have seen this error, that the certificate has been changed successful in OCS but it hasn’t been changed in the IIS.
/Joachim
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