Outlook uses a proprietary format for its internal folders. Even if the format is documented, they may use various forms of encryption for the whole folder or parts thereof. The only way to read such folders is by using some microsoft library functions (if they exist).

I don't think you are going to find a perl solution to read them since a perl solution would tend to be open-source and would likely not able to be easily integrated with a MS-closed source solution. While it is be possible, I think it unlikely. Maybe someone else has more knowledge about this area though. Have you tried a google search, like 'read outlook folders with perl' ?

Good luck.