Mailbox database size not getting reduced.


We have Mailbox server which is part of  Ex 2010 - DAG. We have database named :Mailbox Database 1803077165 on this server.
The size of this database 4.5 GB resulting in low disk space on the drive.
The database is present in the Exchange server folder : C:\Program Files\Microsoft\Exchange Server\V14\Mailbox.
We have moved some the mailboxes from this database however size is not reducing.
We also have system created mailbox on same mailbox database. Admins moved some user mailboxes to this database unknowingly.
I am mlooking for option where in we can reduce the size of the database without taking downtime.
We had moved user mailboxes but the size is not reducing.
Please Help.

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Raheman M. AbdulSenior Infrastructure Support Analyst & Systems DeveloperCommented:

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ex_adAuthor Commented:
I found below article :

Is it applicable to Exchange 2010, as per article it applies only to Ex 2003...
As previously mentioned, the size will only reduce if you do an offline defrag, but to do that you will need to dismount that store.  Exchange doesn't automatically reduce the DB size, because it likes to hang onto the used space in case it needs it in future.  Perhaps you can move all the mailboxes to another store?  Unless you are saying (in the last line of your question) that you already did this?  Or do you mean that you only moved /some/ of the mailboxes, not all?
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ex_adAuthor Commented:
We have moved some of the mailboxes and not all, however we could not find much redcution in the size of database.
My question is,
Can we follow article for Exchange 2010 also?
Yes, I did it myself recently, after having to repair an information store.  The syntax of these commands doesn't seem to have changed for years.
It's the same commands like that article, however I would suggest you to instead either extend the storage for that disk or just simply move those mailboxes to another db placed on another disk/lun and then remove this default db.

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You can find them using get-mailbox -arbitration
Raheman M. AbdulSenior Infrastructure Support Analyst & Systems DeveloperCommented:
Yes it applies to Exchange 2010 as well.
Have you performed a full exchange backup to ensure unneeded log files are removed?
ex_adAuthor Commented:
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