[EXCH] Event ID: 9646 User exceeded the maximum of 500 objects of type “objtFolder”.

Shared mailboxes setup in cache mode will download entire content of the mailbox and will register every folder in each cached mailbox toward the objtFolder type limit on the server that’s running Exchange Server. By default, objtFolder limit is set to 500 per-mailbox limit.  Once the limit is exhausted, user will start experiencing the symptoms   →