>>My Office 365 is coming to end of the first year. So I need to renew the subscription. I see the button Buy in Outlook. But when I click, MS asks if it is ok to make changes to this computer. I don't trust MS as they may start upgrading OS too. Is there a way to Renew Subscription without having MS making changes to my PC?
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>I knew that MS always screws things up. I purchased and installed one-year subscription and of course the entire set up of Outlook is changed. What a pain.

There is a way to backup and restore all that if you know where to look in the Windows Registry - but I guess it's too late now. Next time maybe :)