I was transfering my cell phone contacts into a new folder for that in
Outlook. Somehow I did something that closed all my contacts folders, my
calendar and my e-mail and I get this pop-up box:

Unable to expand the folder. Another application closed unexpectedly while
using your personal folders file 'C:\documents and settings ... outlook.pst'
to prevent potential damage to your Personal folders file it will not be
available until you close all apps using it.

I have closed all the apps but when I retart outlook I can not find
anything.  I do have a back up file pst file.  

How do I rectify thi situation??

Thanks Evan