A Microsoft file hosting and synchronization service.
I've just experienced the same problem. I have a file that I update almost daily, and it's just reverted back to a version from 8 months ago. Every one of the 50 or so available versions in version history takes me back to the April version leaving me with 8 months' worth of missing financial data. I'm just consolidating all my data onto One drive ready to migrate to a new Windows 11 PC as recommended, and now I'm having 2nd thoughts. Is there any way to break the links of all these version history versions that point to an old out of date version? One drive must have my version from yesterday stored somewhere. Unlinking and relinking doesn't work - just reveals a whole swag of new unsynced files. Restore can't find a restore point, nor can File History.
I too just turned on an old laptop that has been out of action for months with Bitlocker key problems and my issue has arisen since then. I wonder how many other files have been trashed.
welcome to hell don't know what to do .... sa e to local commuter and backup to external drive. Microsoft sucks.