Store size and personal mailboxes conflict

When navigating to the .edb and .stm locations and totaling the size it is 73.4 GB total, when I locate all the personal mailboxes and sort them by size and add those numbers it equals 28 GB.  Is there a reason why this would occur should they both match up in size?  What else would be in those .edb and . stm databases that would be almost 50GB of data?
PvteyeAsked:
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BDoellefeldCommented:

Like any database it grows with the data it contains.
In your case, at one point your email store had 73.4g worth of email. When email is deleted it will give you free space inside the email store.The email is gone, and you have free space inside the database, but the physical store footprint size does not automatically decrease. To decrease this size you need to perform an offline defrag of the store.
I bet your seeing warnings in your event logs about the store going offline and that prompted a big email cleanup. There are 2 factors exchange will consider before it takes the store offline, the physical size and how much free space is inside the store. Since you have a good amount of space inside the store you can safely ignore the warnings and just keep an eye on the free space. Warnings have a habit of driving me nuts though. if you want to do the offline defrag this is the best step-by-step article in my opinion;
 http://www.petri.co.il/defragment_exchange_2000_2003_server_databases.htm
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PvteyeAuthor Commented:
Will need to perform an offline defrag thank you for the help
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