In the Enterprise Vault event log the following event will appear:
Event ID: 3196 An error has occurred whilst synchronizing the properties of mailbox /o=Messaging/ou=Exchange Administrative Group (XXXXXXXXXXXXXXX)/cn=Recipients/cn=username on Exchange server EXCHSERV1.
Error: Unspecified error (0x80004005)
Category: Archive Task
V-437-3196
A Dtrace of the AgentClientBroker process during a manual synchronization of the mailbox and the following is observed
(AgentClientBroker) <10480> EV:M Unable to save new settings message ([0x80004005]) [/o=Messaging/ou=Exchange Administrative Group (XXXXXXXXXXXXXXX)/cn=Recipients/cn=username ]
then run the PowerShell command:
C:\Windows\system32>Get-Mailbox -Identity 'username' | fl MaxReceiveSize,MaxSendSize
If MaxReceiveSize has been changed by the Exchange administrator to a value less than 20kb, that is likely to be the cause of error as AgentClientBroker is unable to save Enterprise Vault filter message in the mailbox.
Depending on the content of the policies being synchronized, the Enterprise Vault filter message might need more than 20kb so it is advisable to request the Exchange administrator to remove MaxReceiveSize limit altogether first, to confirm the scenario, and then run tests to adjust the limit accordingly to the company minimum requirements.
This limit has been observed when Exchange administrators wish to make the mailbox inactive in terms of email flow without actually deactivating it.