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So I had just finished our SBS 2011 exchange 2010 setup a few days ago. We use a 1tb drive split into two partitions of 500gb ea. One is used for the OS and Exchange and the other for Data. After setting up exchange I discovered a few days later that Database had gone from about 10gb to over 300gb! I was finally able to get this back down to a reasonable amount by temporarily turn on circular logging and turning it off. This immediatly reduced the size of the database but need to know how to permenatly fix the issue as I am convinced it is goint to build quickly again. 
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So I had just finished our SBS 2011 exchange 2010 setup a few days ago. We use a 1tb drive split into two partitions of 500gb ea. One is used for the OS and Exchange and the other for Data. After setting up exchange I discovered a few days later that Database had gone from about 10gb to over 300gb! I was finally able to get this back down to a reasonable amount by temporarily turn on circular logging and turning it off. This immediatly reduced the size of the database but need to know how to permenatly fix the issue as I am convinced it is goint to build quickly again. 

Exchange 2010 extreme mail database

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.