I have the same problem. I have read in other messages here (see duplicate contacts) about this, that installing the latest version of msn messenger seem to fix this(sort of). I did this and it seem to cut down the amount of times I get the message when using windows messenger, but I still get them from time to time
I notice that windows messenger seems to have problem shutting down alot when logging off, even with a new install. There is a problem somewhere, but it doesn't seem to be one that people know how to get working properly
Maybe this will help you in the short term, until the problem can be addressed by someone with a proper solution.
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