What an awful, catastrophic experience. I have just spent over 36 hours reformatting and restoring my macos 12.2 system after OneDrive upgraded in the middle of a work session. I came back to my desk, and noticed that all my open finder tabs, which I usually have open to key folders on OneDrive, were now just pointing to my root drive. All my Favorites (pointing to OneDrive locations) in Finder also were wiped out. And all my OneDrive files -- almost 1 terabyte -- appeared to be missing from my machine, just in the cloud. Without any foreknowledge of this upgrade, it *looked* to me like my file system had been corrupted in some way. I rebooted my system, and the reboot was extremely slow, which also pointed (to me at least) that the filesystem was corrupted. I went into OneDrive (the newly upgraded version) and tried to get the files back locally, but that didn't seem to work. Again, without any knowledge of this upgrade, it looked like a file system corruption. So I proceded to wipe my main disk and start a restore from a time machine backup from earlier in the day. I am finally almost back to normal, and luckily I stopped OneDrive from trying to update itself again. I will not update OneDrive to 22.x until MS fixes these problems. This is, without a doubt, the worst software update experience I have had with a consumer software product in 10+ years. Terribly frustrating and wasted 36+ hours of my time. Just awful, Microsoft.