> Is there any other tool that can read the pegasus-mail-file and transfer it to an imap-account?
Download Mercury/32 and install it on your computer. You'll need to configure it with a default user account and copy your Pegasus mail account folder (probably c:\pmail\mail) to the default user account. Make sure you install the IMAP module. Test your setup within WinPMail, you should be able to create a new IMAP profile connecting to 127.0.0.1 and see your Mail folders.
Now download IMAPCopy:
http://home.arcor.de/armin.diehl/imapcopy/imapcopy.html
Configure it to copy from 127.0.0.1 to your IMAP Server remote account. These configuration settings are entered into the ImapCopy.cfg file. Then run:
imapcopy.exe -s -e
the -e tells IMAPCopy to copy all folders, including empty ones and the -s tells IMAPCopy to subscribe you to any folders that are created on the destination. When IMAPCopy finishes, you should have all your Pegasus Mail folders/messages moved to the IMAP Server.