Database size, Exchange 2007, doesn't match mailbox sizes

Hello - My mailbox database (.edb file) is showing at 32 GBs.  If I do a size check on the mailboxes, they only total up to under 20 GBs.  So, I'm wondering what the rest of the space is being used for?

(We don't have a lot of user change or mailbox deletion, so I don't think it is larger, older mailboxes marked for deletion, but not yet gone.)

How do I determine what the other 12+ GBs of consumption is being used by?

Thanks!
StewartTechnologiesIT ConsultantAsked:
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Rajitha ChimmaniConnect With a Mentor Commented:
This whitespace is automatically when a new mailbox is created or when a email is stored within mailboxes.

However, you have two options here.

1. Offline defragmentation - I would personally not recommend this as there is huge downtime.
2. Create an empty database, move the mailboxes to that database and Delete the source database.
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Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
So, I'm wondering what the rest of the space is being used for? - Check event 1221 in Event viewer and that is the White space if the Database that can be reused for new data by the Mailboxes on that Database

- Rancy
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Rajitha ChimmaniConnect With a Mentor Commented:
What is the amount of white space? (You can find it from the event 1221 in your application logs)
What is the size of disconnected mailboxes?

Also, I got to know some 10-20% of edb file size is dedicated for storing the Jet Engine architecture.
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StewartTechnologiesIT ConsultantAuthor Commented:
Event 1221 reports " has 9365 mb of free space after online defrag has terminated."  So, there's 9GB right there.
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StewartTechnologiesIT ConsultantAuthor Commented:
I'd like to 'force' the reclaimation of that space.  Is this possible?  I hope that makes sense!
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Reclaim but anyways if your not too crunch on Disk size you can always leave it as it is as it will be anyways used by new data as there is always going to be some White space in Database so you cant always run Offline Defrag or Move mailbox if its not too low Disk space issues concern

- Rancy
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StewartTechnologiesIT ConsultantAuthor Commented:
This is Exchange 2007 on SBS 2008 box, so I'll have to research the ramifications of creating an empty database and moving the mailboxes.

I have had to use eseutil to address a database corruption or other database issue before. Not saying I'll go that way with offline.

I'm trying to reduce, to help reduce the database size, in relation to backups.

Overall, we are trying to do purge of old mail, and then shrink the DB size.
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Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
Soi would say you can use Offline Defrag as an option then ....
eseutil /d "location of EDB"

- Rancy
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StewartTechnologiesIT ConsultantAuthor Commented:
Thank you both for your helpful feedback / answers.
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