I have an office that I just upgraded to Outlook 2010. Most machines just required an upgrade and all of them work fine. Two people had new machines in which I exported all of their data from Outlook 2000 to a pst to import. I first just loaded Outlook 2010 and tried to import. Outlook did nothing but hang after the import was completed. I could see the new messages had been imported but you could not do anything in Outlook. tried reboot - same situation. I then tried to import the 2000 pst into a 2003 Outlook client with no issues. I then saved that pst in 2003 format and tried the import again with same results. Next I tried just opening the pst seperatly and Outlook worked fine until you clicked on that pst.Finally I removed 2010 off of the machione and imported the pst and then upgraded tp 2010 on the machine itself. same results. I can use 2010 on the machine and new messages come in fine - it is just when I import the old messages that it hangs. Any suggestions would be great.