Creative Spec: Windows Live Messenger ActivityOct 30, 2009 … It includes the 'Share'' button on the 300x250 expanded portion. … 4.1 General Creative Design Requirements …http://advertising.microsoft.com/FriendlyName/SharedDocs/auto/CreativeSpec/CreativeSpec_CS62_C35743_L35788.doc/Windows%20Live%20Messenger%20Activity.doc