New
#730
That would make sense.
It's pretty recent that they changed OneDrive to sync Documents etc.
https://support.office.com/en-us/art...a-6552e77c3057
So if you had Documents etc. synced to Onedrive, but those folders were Files on Demand and in the cloud (so you don't have the physical files on your drive any more) then you could see how that might go wrong when they migrate to the new Windows installation's Users folder. And then maybe OneDrive uses the C: drive version as the "Master" copy and deletes the cloud version? Just guessing though - I'm pleased to say I'm not affected by it.