Dear Allone of our DB's log file has been delete, now the DB can not be mount.is there any recovery step on about it?thx a lotKen

Hi Ken, Whats the relevant event error? Please verify that the database was shut down in a clean (consistent) state. Use ESEUTIL /MH. If the database is shutdown in a dirty (inconsistent) state, you cannot mount it and you must replay at least one transaction log file to bring it to a clean state. If the issue persists, we suggest you restore from backup. How to back up and restore an Exchange computer by using the Windows Backup program http://support.microsoft.com/kb/258243 A good article for your reference: What to Do When an Exchange Store Won't Mount http://technet.microsoft.com/en-us/library/aa996027(EXCHG.65).aspx If anything is unclear, please let me know. Thanks, Elvis