Just a note for all of you leaving a company and wanting to take your precious personal mail with you. Do not backup your .OST file. Export your email to a .PST. The .OST is tied to your Exchange credentials and if you don’t have access to the Exchange server the .OST is attached to you’re in trouble. I know because I tried every suggestion in this thread and none of them worked (and it took hours to try them all).
Now, if you do make the mistake of backing up your .OST because you think it’s the same as .PST (it’s not!) there is hope. The only option that worked is this service, Password Crackers, who for $15 will convert a .OST to a .PST. Much cheaper than spending $600 on a program to do it yourself, granted now all your secrets have now been shared with a cracker group :).