"Anyone has a tip on how to import a wab adressbook (from outlook), into mozilla mail?"
When I converted from Windows to Linux about three years ago I had not problem converting my address book from Windows Netscape to Linux Netscape. Later, I easily converted my address book from Linux Netscape to Linux Mozilla. So if you can find a program which converts Windows wab to Windows Netscape you might be able to go:
Windows wab -> Windows Netscape -> Linux Mozilla
Check Netscape to see if it has an import program for Windows wab.
Be prepared. Create a LifeBoat CD.