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How to offline defrag Exchange server 2010 database

When working with exchange, it happen sometimes that the exchange database is using high disk space and even you and users are deleting/archived some mails but the size is not getting low.

In that scenario, You an exchange administrator or system administrator must perform offline defragmentation of database.

There are some points which you must be follow before starting the offline defragmentation:-

1) During the offline defragmentation exchange service would be stopped. So no mail access would be working during that time

2) Before making some free disk space for the drive in which exchange database present, you need approx 1.1x of database size somewhere in your network. 
First you need to check how much white space you have in your exchange database. White space means the space which will be free once you run the defrag utility.
to check it you can open Exchange management shell and type.
Get-MailboxDatabase -Status | ft name,databasesize,availablenewmailboxspace -auto[PS] C:\>Get-Mail…