Microsoft Exchange
Microsoft Exchange licensing on Server plus CAL versus Exchange Online, and what still sits on-prem after a Microsoft 365 move. This category is the Exchange file, not Microsoft 365 and not Skype for Business.
Microsoft 365 holds the cloud seat overlay. CALs hold the access-license math. Hybrid deployments still need both reads. Use this file when Exchange Server or Exchange Online is the SKU on the paper.
A Final Reprieve: Microsoft Announces Paid Extended Security Updates for Exchange and Skype Servers
Microsoft has officially announced a paid Extended Security Update (ESU) program for Exchange Server 2016…