I was running Outlook 2007 on Vista with no problems. My hard drive crashed. I had a new hard drive installed, Windows 7 Professional installed, and the Outlook data file transferred to the new hard drive. I tried Outlook and found receiving was very slow. When I hit the 'send/receive' button, the progress screen pops up and I can see that 'send' executes immediately, but 'receive' takes from 40 to 60 seconds before incoming emails appear. I immediately thought that it might be a firewall issue, however, this problem occurred before and after antivirus software was installed.