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Yes, the Exchange server needs to have an OS, eg: Server 2003, to be installed on.<br />
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Will the 60 user base be accessing the servers as all times? BEcause licensing can be based on concurrent connections, (how many users will be accessing the servers at once).
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Yes, the Exchange server needs to have an OS, eg: Server 2003, to be installed on.

Will the 60 user base be accessing the servers as all times? BEcause licensing can be based on concurrent connections, (how many users will be accessing the servers at once).

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OK - this is kind of a silly question - but I'm just getting the feel for the MS Server OS licensing model:<br />
if Im building 2 servers: &nbsp;one of which will be the PDC / File server and the other will be the Exchange server&amp;(Assuming that i'm loading 2003 versions of both) does the Exchange server need to have Server 2003 running on it as well?, or will the Exchange server software load on the box as a stand-alone app that will see the 2003 server&amp;Im guessing the Exchange Server needs its own 2003 server OS as well correct?<br />
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(Assume a 60 user installation) So in essence, for the 2 servers: will I be buying 2 copies of MS Server 2003 (one for each box, with 60 CALs each?), and Exchange server 2003 (with it's own 60 CALS?)<br />

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OK - this is kind of a silly question - but I'm just getting the feel for the MS Server OS licensing model:
if Im building 2 servers:  one of which will be the PDC / File server and the other will be the Exchange server&(Assuming that i'm loading 2003 versions of both) does the Exchange server need to have Server 2003 running on it as well?, or will the Exchange server software load on the box as a stand-alone app that will see the 2003 server&Im guessing the Exchange Server needs its own 2003 server OS as well correct?

(Assume a 60 user installation) So in essence, for the 2 servers: will I be buying 2 copies of MS Server 2003 (one for each box, with 60 CALs each?), and Exchange server 2003 (with it's own 60 CALS?)


Help with CALs and MS licensing

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

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.