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We recently removed all 5.5 servers from our 2003 organization. Do we still need the MTA Stacks services running? 
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We recently removed all 5.5 servers from our 2003 organization. Do we still need the MTA Stacks services running? 

Exchange 2003 and MTA

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.