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Exch 2007 database size doesn't match up with sum of mailbox sizes

The exchange database (.edb) is showing as approx 30GB in Windows Explorer.  When I run a "get size" script, the total of the mailbox sizes is only 15 or so GB. So, I'm wondering what the other 14 GB is being used by, or what it is for?   Does this mean I need to run a db defrag or other utility?
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Seth Simmons
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Thanks for the feedback so far.  

I'm concerned about making a new Exch db as this is Exch 2007 on SBS 2008, and SBS does some very unique items to Exchange and I'm concerned in the long run, this new DB will cause more issues.  
Any ideas on this?
Just as an update, db is 36 GB.  That seems like excessive white space.  We are having performance issues (sluggishness and freezing), which is why I'm considering eseutil or a new DB (under the same storage group).
Following the event log suggestion, I have found this log ...

"First Storage Group\Mailbox Database" has 13530 megabytes of free space after online defragmentation has terminated. "   

This is 13 some Gigs right here.  How can I purge this large swath of free space?

Thank you.
There is a way to offline defregment but as you mentioned you are facing some performance issues so better to create a new DB and move all users to new DB.

Else you can do offline defrag. Reference Article for ESEUtil Defragment details.

Command: C:\program files\exchsrvr\bin> Eseutil /d c:\progra~1\exchsrvr\mdbdata\priv1.edb

Note: Offline Defag process is time taking process and it need downtime of Database.
Thank you both for your help.  I ended up creating a new DB and moving all the mailboxes. We are now at a more appropriate db size.