When you migrate from Exchange 2003 to Exchange 2010 you may have some problems with xml attachments. Al of a sudden xml attachments are sent as application/xml mime type instead of text/xml. In our case the application was specifically looking for text/xml, and thus wouldn’t detect the attachment.
Both during the TEC panel discussion and the Pro-Exchange “Meet the product team” event some questions were asked about Public Folder HA. (Hi “Dave”!). A nice occasion to combine some of the screenshots we had lying around in a blog post.