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I think this is exactly what I was looking for. <br />
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(FYI, if you know the answer to the same issue in GroupWise with this much detail I have another 500 question for you)
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I need a way to automatically delete all mail on an Exchange server before a specific date. I want all email to only be accessible for two years. For example I would want all mail older than 10/4/2005 to be deleted as of 10/4/2007 giving us a retention policy of 2 years. When it is October 4th 2008 I would only want mail to be on the server newer than 10/4/2006. 
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I need a way to automatically delete all mail on an Exchange server before a specific date. I want all email to only be accessible for two years. For example I would want all mail older than 10/4/2005 to be deleted as of 10/4/2007 giving us a retention policy of 2 years. When it is October 4th 2008 I would only want mail to be on the server newer than 10/4/2006. 

I think this is exactly what I was looking for. 

(FYI, if you know the answer to the same issue in GroupWise with this much detail I have another 500 question for you)

Exchange auto delete mail by date

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

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.