A Microsoft file hosting and synchronization service.
Same with our company. It's been a brutal 9 months of waiting for a few of our staff, and here in this past week, several of our staff who haven't had this issue now do have it, so we've actually been going backwards with this issue. I'm giving it one more week I think before switching to another service entirely as enough of the staff have the issue now that we're at that breaking point basically.