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From experience what are the advantages and disadvantages of upgrading from MS Exchange &nbsp;2003 to 2007? <br />
What additional features that Exchange 2007 have over 2003?<br />
What problems are corrected in Exchange 2007?<br />
What are the differences in performance?
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From experience what are the advantages and disadvantages of upgrading from MS Exchange  2003 to 2007? 
What additional features that Exchange 2007 have over 2003?
What problems are corrected in Exchange 2007?
What are the differences in performance?

What are the advantages and disadvantages of upgrading from MS Exchange 2003 to 2007?

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.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.