I offer technical assistance to my church staff who are all using Macbook computers running Parallels 10/11 and Yosemite/El Capitan. No matter which version of Parallels or Mac OS, every time they have to update their individual Office 365 subscriptions, it triggers a need to reactivate Windows 7. I thought only hardware changes triggered that. It's annoying to constantly have to get their computers, find the key and reactivate Windows 7. I fear that this constant reactivation will eventually trigger a reaction from Microsoft to say that the key has been used too many times. Why is something that is as simple as updating software or for that matter, even loading software, triggering a reactivation? Thanks in advance as this will be happening many times as long as these 4 computers are updating Office 365.