Windows Server CAL's / Exchange Server CAL's

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?
Who is Participating?
Felix LevenConnect With a Mentor Senior System and DatabaseadministratorCommented:
Not if you install Exchange 2010 on 2008R2 and the cals you own are the 2008R2 Versions.
Nick RhodeConnect With a Mentor IT DirectorCommented:
If you have CALs for server 2008R2 then no.
HaulnSSAuthor Commented:
That is what I thought, wanted to make sure.
HaulnSSAuthor Commented:
Gave MrGraves more points, since he answered first.  Thank you!
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