Using Activesync 6.1 on Vista Home Premium with my Dell Axim x51v. With the Firewall set in Automatic mode I find that the synch with MS Outlook is hit and miss. It seems to work in Interactive mode most of the time but I hate being prompted to approve. I don't have problems connecting or browsing my PDA but modifications I make to files on my PC don't always automatically synch when they change. The easiest way to test this is to enter a test appointment on my Outlook calendar. Sometimes it synchs in ESS automatic mode and sometimes it doesn't. My NIS 2007 is expiring soon and I am hoping to switch to ESS as other than this problem it looks great!