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  1. Before even thinking about beginning this process MAKE sure to have a backup of your database that you are going to defragment!
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  2. Login as Exchange Administrator.
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  3. Open Exchange management console.
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  4. go to Server Configuration>Mailbox
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  5. Select the server you want to view>expand the storage group that contains your database you want to run maintenance on.
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  6. Highlight the database path and hit cntrl+c this will copy the path for later use
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  7. In the action pane dismount the database
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  8. open command prompt.
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  9. switch to the directory where your database is located C:program filesmicrosoftexchange serverbin
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  10. type isinteg.exe -s <servername> -test allfoldertests - this will display all of the database files
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  11. type the corresponding number to run offline maintenance followed by Y for yes to confirm
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  12. Keep running this utility until all of the errors are cleaned up
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  13. At the command prompt to perform a database level integrity check run the following command - Eseutil /g "database file path"
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  14. Once this is done free of errors defrag the database by running - Eseutil.exe /d "database file path"
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  15. Once step 14 is complete go back into the Exchange Management console to mount the database
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