Wow that sucks been there done that, unfortunately is was only around 40 mailboxes so I just imported the .pst in each persons outlook. Have you looked into exmerge I could never get it to work, and...

Go into outlook -> file -> import -> import from another program or file -> personal folder file .pst -> select the .pst for that user from the mobile backup import it to the exchange account hit...

start -> run -> msconfig to disable any startup programs

I think windows briefcase can, folder redirect with file sync. Is it on a domain?

You need a space between the .exe and /integrate

It should work are you typing in the path correctly to where you copied the install cd?

Can you boot into safe mode? Try and add a new user if you can