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Windows Server 2016 is the economical choice for a secondary server, a test lab or an existing infrastructure that has to stay on the same generation. Microsoft support ends in January 2027, so any new production deployment should be planned with that date in mind. Chkey.ch offers it at Swiss prices.
Standard allows two virtual machines per licence, Datacenter removes that limit for a virtualised environment, and the Essentials edition targets small organisations of up to 25 users. Remote Desktop Client Access Licences, per user or per device, are sold separately and are required for RDS sessions.
Your key is emailed within 24h, Swiss invoice included.