Last month Microsoft started sounding the “end of support” death toll for Exchange 2007. Admins have a year to plan and migrate to either Office 365 or a newer version of on-premises Exchange. (If you go with on-premises Exchange, I recommend Exchange 2016 because Exchange 2013 is already three years into its 10-year support cycle and Exchange 2016 is a slightly beefier version of Exchange 2013 — basically, you get three extra years of support by adopting Exchange 2016.)
Some people accuse Microsoft of holding to a strict end-of-support strategy — which often gets labeled “end of life,” though the software still functions to continue extracting money from customers’ IT budget. While there might be some truth to that argument, it ignores the fact that much has changed in technology in the decade since Exchange 2007 was released.