Hi,
If outlook was configured to download the messages without having a copy on the server, then all the files are gone after the drive formatting.
You can try the Symantec Unformat or Unerase programs to try getting the whole drive back to the state before you format the drive. It is not 100% reliable that it will unformat or unerase all your data, but you can give it a try. Unformat will revert the WHOLE DRIVE, so any info you have now will be "lost".
Both programs run under DOS, so im not quite sure if you can make a bootable Floppy or USB and load the files there, then run them and see what happens.
Other than that, I do not remember any other programs to get information back.
It might worth a try this links:
http://www.softonic.com/s/unformat http://www.download.com/Active-Undel...-10125714.html
Good luck.