unable to access outlook after upgrading


New Email

i was using outlook 2003 from past 3years to access my emails. last week i successfully upgraded to outlook 2007. after configured my outlook account and just copied the PST file from my backup and replaced but am unable to access. again i tried more than 10times but same error. so is there any particular way for importing pst file or outlook migration with which i can get all my previous outlook data in 2007.