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Microsoft teams on premise prerequisite

Dear Experts:
We are in process of implementing on-premise exchange enterprise email server as we cannot use could email services.
We have SQL standard as database server on separate windows server and we have windows Active Directory system, we have additional windows server license of  2019 ,  we would like to setup  Microsoft teams for internal chatting please suggest is there any license subscription to be procured and is it possible to setup on-premise teams for internal chatting, please help to understand prerequisite in terms of software to be procured, please help to understand this, thanks in advance.
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Distinguished Expert 2019
Commented:
we would like to setup  Microsoft teams for internal chatting please suggest is there any license subscription to be procured
Teams is a 365 product, and therefore cloud only. There is not an on premise option. Besides, not using cloud email doesn't mean you cannot leverage other cloud services.
Jeff GloverSr. Systems Administrator
Commented:
If you want on-premise only, you have to license Skype for Business server and you will need Office CALs to connect to it. (Skype for business client is part of Office Premium 2016 and 2019 Suites)