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So what will happend if i used only 20 Exchange UsrCALs
There is a bit of necessary information missing here, such as what licenses you already own and of what type. I'll make some huge assumptions and give you a scenario:
Assuming that you are using user CALs (the most common type) then you need 50 Windows Server CALs total which you should already own since you need them for your existing setup sans Exchange. No new Windows Server CALs are needed for adding another server if they are user or device CALs.
Assuming that all 50 users will get Exchange mailboxes, you need 50 Exchange CALs. Everyone using Exchange needs both a Windows Server CAL (which you already should own) plus an Exchange CAL.
Ok.... but you're not being clear about what you're asking... Can you clarify so we can help you?
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CALs are a documentation process
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