SBS 2008 Exchange Server will not mount

My SBS server rebooted on it's own. I restarted it and now Exchange FS1 will not mount. Giving me an error

MapExceptionCallFailed: Unable to mount database (hr=0x80004005, ec = 1852)

Any suggestions....urgent help is needed.
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tvaldez63Author Commented:
Thanks everybody. None of the above solutions worked so I had to go to a backup from 12 hrs earlier and it worked great. Thanks for the helpful suggestions  though.
Kindly check if the Exchange Information Store Service is Started or not.
If yes then kindly check if the database files are in Clean shutdown or Dirty shutdown
If Database is clean shutdown then remove all the log files and try mounting the database and if database is dirty shutdown then need to check if the required log files are available or not and we need to deal with that accordingly
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Is Event ID 9519 logged in App logs ?
If yes run the below command
Run Setup /PrepareAD

- Rancy
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
There are a number of good suggestions for this issue here:

tvaldez63Author Commented:
Used last backup to get exchange store back up and running.
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