GoneWest,
I had exactly this problem a few days ago.
Export your current addressbook as a "comma- delineated" file onto a floppy. (This was the only option in the "File" menu which allowed me to specify where the exported file actually went!)
On your second machine, choose "File" then "Import" and import as a "comma- delineated" file, selecting the floppy as the source.
Worked a treat and transferred my whole addressbook over in a few seconds.
I tried exporting as as *.WAB file (addressbook format) and the machine blithely stated the export was completed...but didn't tell me where in hell the exported file had gone!
As soon as I specified comma-delineated, then I had the option to choose which drive to export to and from which to import, which was exactly what I needed.
Hope this helps.