Bottom line: Be very careful installing Microsoft .NET Framework 3.5 on a machine that works with custom InfoPath solutions. One of my clients has a customized InfoPath 2007 (Not browser enabled) form, that recently went into production. As it was exposed
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Read the complete post at http://blogs.microsoft.co.il/blogs/itaysk/archive/2008/04/18/net-framework-3-5-and-infopath-compatibility-issue.aspx