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for the more percise details see: <a href="http://www.microsoft.com/forefront/serversecurity/exchange/en/us/pricing-licensing.aspx" rel="ugc">http://www.microsoft.com/forefront/serversecurity/exchange/en/us/pricing-licensing.aspx</a><br />
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the short of it is that an internet facing server is licensed per-server (each server using the product must have its own license). &nbsp;The up side to this is that if you are trashing the current server during this upgrade, then you can use your current license on the new server.<br />

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Thank you for you quick response. I've been reading up on antigen on the technet antigen technical library. One of the reasons for the move to the smtp gateway is that the sbs server is having memory poblems. &nbsp;SBS 2003 and SQL 2005 are both installed on our main server. I've been reading up on the allocated memory problems on sbs servers, but want to move antigen onto a server on it's own to release more memory and better protect our private network. &nbsp;Is it sufficient to have only one antigen installation on the smtp gateway? &nbsp;I guess an intelligent messaging solution could co-exist? &nbsp;From a licensing point of view, can i just uninstall the antigen instance on our main server and re-install it on the smtp gateway? &nbsp;Do i need to copy any license files etc?
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What i will do is, i will do a full restore in our test enironment and try uninstalling it from our main server (in the test environment ) and reinstalling antigen onto the smtp gateway (in the test enivironment). &nbsp;Less down for everyone that way! &nbsp;Thank you for the direction
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Could someome please explain to me how antigen 9 for smtp gateways is licensed? &nbsp;Currently we have antigen 9 installed our sbs server and are looking to move it to a newly created smtp gateway server.
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Could someome please explain to me how antigen 9 for smtp gateways is licensed?  Currently we have antigen 9 installed our sbs server and are looking to move it to a newly created smtp gateway server.

Antigen licensing

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

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.