Go to MSN Messenger main windows. GO to Plus!-Preferences, in the CONTACT LIST menu, you can see an option HIDE THE ADVERTISEMENT BANNER--->Tick that on.
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i did that but the ad still comes back (i think that its a bug
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picture is below
I allready unistalled msn messenger (6.2) & plus!3 and installed again but its still coming back. AND i did nothing with a original msn messenger file.