Oct 15, 2015 · v7.8 of the calculator introduces support for Exchange 2016! Yes, that’s right, you don’t need a separate calculator, v7.8 and later supports Exchange 2013 or Exchange 2016 deployments. Moving forward, the calculator is branded as the Exchange Server Role Requirements Calculator. When you open the... Microsoft Exchange Server is a mail server and calendaring server developed by Microsoft.It runs exclusively on Windows Server operating systems.. The first version was called Exchange Server 4.0, to position it as the successor to the related Microsoft Mail 3.5.