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...of opportunistic locking on NT. You can turn off opportunistic locking for SAMBA pretty easily for a share by setting oplocks = False To turn off write-behind-caching you have to make changes in the Windows registry. It is best if I give you a couple of URLs that go into more details: http://www.smartway.ch/omnis/support.html (At the above URL you will find a small tool that makes the registry changes for you.) http://www.omnis.net/tech/notes/tndm0002/tndm0002.html Don't know how good your German is but I also have a reference to a Swiss company that uses Dataflex and had similar problems to t...