Well, by the looks of things, WINE is getting pretty good these days, with the ability to run IE5+ (although 6 has problems), so you might be able to run iNotes using that?
(see
http://images.mandrakesoft.com/img/scr/mdkwine.jpg - linked from
http://www.mandrakelinux.com/en/fscreenshots.php3 )
Also, for the same reasons, if Office worked under WINE (at least one version seems to from the above screenshot), that might solve the problems of Office integration, especially on the support front ...
Since I'm sure that people have R5 running under WINE, the only problem left would be to make R6 runnable under WINE (at the moment there are problems doing this ... - see
http://wine.codeweavers.com/bugs/show_bug.cgi?id=1078
and
http://wine.codeweavers.com/bugs/show_bug.cgi?id=1077
)
Steve.