Made the jump from 2003 - 2010 a week ago and havent run into any serious hitches. I am, however, starting to see a minor bug where Outlook 2007 users will click on a folder other than the inbox (sent items, user created folders) and the folder will appear empty. If they try and sort via date or name or anything of that nature all the mail items reappear. Strange. Anyone seen anything like this?