I have an issue in my MOSS 2007 SP1 environment (12.0.0.6307) where uploading a .MHT file results in a no "boundary" in CGI environment, which was first addressed in Windows SharePoint Services 3.0 Cumulative Update Server Hotfix Package (Sts.msp): June 30, 2009 http://support.microsoft.com/kb/970946 So I went ahead and cloned my environment. Everything but the navigation paths came across just fine. I then applied SP2, everything was successful, I just received a few warning RE: Sharepoint Search Service. So Then I went ahead and applied the latest CU, February 22, 2011 (http://support.microsoft.com/kb/2475885) Now not only can i STILL not upload a MHT file, I now have almost all web parts, reporting- Web Part Error: One of the properties of the Web Part has an incorrect format. Windows SharePoint Services cannot deserialize the Web Part. Check the format of the properties and try again. Any thoughts? Thanks, Jon

Update: Resolved other issues in our dev environment, and am finding that only certain .MHT files produce the no "boundary" in CGI environment error. The Cumulative update does not seem to address the issue fully.