One reason to avoid Office 365

Before subscribing Office 365 one needs to check whether installing Office 365 on a system removes all older Office versions. Mr. John Peltier says he read that this risk exists (http://peltiertech.com/office-2016-for-mac-is-here/), so do not blindly follow the Microsoft marketing push.

Upgrading to Office 365 may present advantages for the end-user, but for an Office developer this is not acceptable.