http://blogs.msdn.com/brada/archive/2004/04/15/114332.aspxIf so you should check out this KB- Information about designing Office XP add-ins and Office 2003 add-ins by using the .NET Framework . The CLR interop team, office folks and others I am sure worked closely to get this information together… Hopeen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/brada/archive/2004/04/15/114332.aspx#114459Fri, 16 Apr 2004 11:58:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:114459Omar Shahine's WebLog