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That is what I thought, wanted to make sure.
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That is what I thought, wanted to make sure.

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Gave MrGraves more points, since he answered first. &nbsp;Thank you!
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Gave MrGraves more points, since he answered first.  Thank you!

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I have 45 users.<br />
I currently have a file server running Server 2008 R2. &nbsp;I have A CAL for each user on that server. &nbsp;<br />
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I am preparing to upgrade Exchange 2003 to 2010 on a separate server. &nbsp;I know I need an Exchange CAL for each user. &nbsp;Do I need an additional CAL per user for the Server side of it?
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I have 45 users.
I currently have a file server running Server 2008 R2.  I have A CAL for each user on that server.  

I am preparing to upgrade Exchange 2003 to 2010 on a separate server.  I know I need an Exchange CAL for each user.  Do I need an additional CAL per user for the Server side of it?

Windows Server CAL's / Exchange Server CAL's

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.