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Sorry folk, I thought I might get a more technical answer! I have been saving it under a different name which is a pain if you update a document every day, sometimes more. However, I have found a solution but I am baffled why it now works correctly. When I open up in the morning I access word by clicking on the windows icon on the bottom left of the screen. This displays a list of three programs, Email, Internet and Microsoft Word (in that order). I recently switched internet and word by mistake. I have switched it round again and it now saves correctly.