That’s plenty of time to dust off the resume and start pounding the pavement! Very generous of Microsoft to give so much notice! Edit: for those who may think I’m overreacting to a small change in tooling, I offer this classic essay [1]. It explains the reasoning behind leaving much better than I could! [1] https://steveblank.com/2009/12/21/the-elves-leave-middle-ear...
Tech layoffs are exploding and there is a looming recession and maybe world war, and you're gonna quit over the work-chat software? At least the layoffs meant people got severances; this is walking for $0 and maybe the ability to find a different office productivity suite. I mean vote with your feet and all, but if this came up in an interview I'd probably laugh at you.
It’s the difference over picking up a recruiter call vs ignoring. Or spending 15 min to fix up a resume.
There are degrees before flipping a table and walking out. Forcing people to use teams when they are accustomed to better software pushes everyone marginally in that direction.