I am getting "Background thread FDoUpdateCatalog halted on database "First Storage Group\Mailbox Store ()" due to error code 0x80004005." MSExchangeIS Mailbox Error 7200, and when I have Full Text indexing on I get "Background thread FDoBuildCatalog halted on database "First Storage Group\Mailbox Store ()" due to error code 0x80004005." I still get the first error whether Indexing is on or off. I do not have AV installed on the server, I have done dcdiag and got an error saying the server is not a DC. Network Diag comes back clean with no errors. The DNS is correct but the server still gives this error and it is running slow even though the processor does not get above 10 percent. Any suggestions would be recommended.