The good part was that client got this issue on weekend, hence there were no issues in production.
After long discussion we decided that migrating to Exchange 2010 won;t be possible due to the budget (as if now) hence he asked for the alternate resolution. After checking the event 1221 for Mailbox and Public Folder Store we found that there is nothing we can achieve even after running the Defragmentation.
We decided to do In-Place upgrade from Standard to Enterprise.The good part is, client had the licensing for Enterprise(I don’t know why didn’t they installed Ent. edition).
Started the upgrade and it failed. Check the application log and found the below event id.
Event Type: Error
Event Source: MSExchangeSetup
Event Category: Microsoft Exchange Setup
Event ID: 1002
Time: 10:21:37 AM
Exchange Server component Microsoft Exchange Messaging and Collaboration Services failed.
Error: 0xc107041d – 0xc007041d – The service did not respond to the start or control request in a timely fashion. (EXIFS)
For more information, click http://www.microsoft.com/contentredirect.asp.
Checked the ExchangeSetupLog and got the error:
Error code 0X80004002 (16386): No interface.
After changing the registry value continued the upgrade and it completed successfully.
Installed SP2 on the server. Restarted the Exchange Server and checked the application log for event ID 1217 for Enterprise edition and it was present, which says that server has been successfully upgraded to Enterprise edition.
Checked the Mailbox Store and Public Folder Store and they mounted successfully. Created New Mailbox Store without any issue.