Question re Terminal Services on Server 2012 R2

I am adding a Server 2012 R2 machine to an existing domain.  The new server will have no primary server function.  The existing domain controller/AD is a 2008 Standard machine.

Only three users will log into this new Server 2012 machine, to run Remote Desktop sessions to run Syspro software right on that machine.

They already have Remote Desktop Services cals for Server 2008.  Do I need to purchase more RDS cals for the new Server 20012?  And, can I buy three, or must I buy a minimum of 5?

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Each version has its own cals. If you have upgrade rights to the cals from 2008 to2012,.

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DaveWWWAuthor Commented:
If I upgrade cals are they still usable on the 2008 machine?
Yes, usually they are backwards supportive, but you should make sure. Are you planing to run both TS/RDS?
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Windows Server 2012

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