Hello, I have additional information. The problem is the entryCSN. User 1, which got replicated has entryCSN: 20150827083333.751721Z#000000#001#000000 user 2, which got NOT replicated has entryCSN: 20150827083333.119585Z#000000#001#000000, which seems to be in the past user 3, replicated, 20150827083334.847604Z#000000#001#000000 user 4, not replicated 20150827083334.228113Z#000000#001#000000, which seems to be in the past user 5, replicated 20150827083335.588191Z#000000#001#000000 user 6, replicated 20150827083335.946835Z#000000#001#000000 user 7 not replicated 20150827083335.282686Z#000000#001#000000, which seems to be in the past So in previous posts I got the answer, that microseconds exact time synchronization is only important with master master and concurrent writes. But now it also seems to be important with delta-synrepl. So I suppose this ITS can be closed, since it is not a bug, but worked as designed? So how to get a good enough time synchronization with windows (since the normal time synchronization of windows seems to be not enough)? Of course, if you close the ITS I can ask this question again in the technical list. Regards, Frank