Exchange 2010 database much larger than Exchange 2003 database size?

Since moving users over to 2003 to 2010, I notice the database is much larger. Can someone explain why and is there a way of stopping it?  I noticed database copies, is it creating backup of all databases?

Thanks  
ocdcAsked:
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ckivmlConnect With a Mentor Commented:
Exchange 2010 no longer has single instance storage(SIS), but I believe that it
would be unlikely that it would cause such growth, especially with their
compression improvements. Please keep in mind during the design phase of an Exchange storage subsystem, SIS was never a consideration or variable used in any calculation. If any user were to modify the SIS'd message at all it would then store a second altered copy in their mailbox. There was never a guarantee every user wouldn't do this and then you would run out of space. Therefore the removal of SIS and the addition of message body compression shouldn't change the way we design the storage system

http://exchangeserverpro.com/browsing-mailbox-databases-in-exchange-2007-and-2010


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ckivmlConnect With a Mentor Commented:
below url will give clear idea about it.
http://technet.microsoft.com/en-us/library/bb331958.aspx
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Viral RathodConsultantCommented:
Please disabled the circular logging ,Other wise it will create too many log files and your database will be too large.
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Viral RathodConsultantCommented:
Sorry, Please Enable the circular logging ,Other wise it will create too many log files and your database will be too large. ,till your are movig the mailboxes,once the mailboxes are moved again disabled the cirrcular logging.
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