Can Outlook Express and Outlook work on the same e-mail dB-file?

Mmmm, no.  If you dial in (or connect via broadband or whatever) directly to your ISP and download mails, Outlook stores them in a pst file; Outlook Express stores them in a dbx file.  You can, however, import them from one format to the other.

Hello asyscokid,
You say that I can import them. Say I using OE, and I want to import my PST file here, how do I do that?
I tried using File->Import->Outlook(as my chosen program)->Select which folders to import... Now this is what I had expected. I expected for the wizard to ask/browse for the pst file but there was no such option.

Please advise,
Lior

I think the problem may lie in the OS.  OE is on a Windows 98 partition (FAT32), Outlook is on the XP partition (NTFS).  OE probably cannot see the XP partition.  So you should be able to import from OE to Outlook but not from Outlook to OE.

Hello again,
All the partitions are formatted as FAT32. The thing is that there is no option that even lets me choose or browse for the PST file. It is not part of the wizard. After I choose which folders to import then I the wizard is finished.
I am using OE version 6.

Thanks again.