Hello, I tested BitTorrent Sync for our company but I got exactly this "locked file" problem after only a few minutes. It was a docx file that was edited on two clients by two different users. The error stays, even after everyone has closed MS Word. The performance of Sync is very good but in the corporate environment it is not about sharing Gigs of movies but hundreds of docx, xlsx, pptx, pdf, ... that are changed regularely. I'm honest: I have not read all pages of the thread but is there some fix? Maybe make all files read-only if it is opened by another user? Or some other rule/setting to avoid a) versioning conflicts and Sync locking files. Best regards