Uhm. This just replaces QuickOffice with Microsoft Office Mobile edition. That is probably for newer E-Series which use S60. For older E-Series QuickOffice license is included with sale.

For a good OO.o port to ARM/S60 or ARM/Linux (and Maemo) you need to 1) port it to S60 2) optimize performance 3) optimize interface 4) easy learning curve. This costs a lot of hard labour; time and money. Besides, OO.o doesn't use Qt. If you're going to switch to Qt on S60 and Maemo why not think about porting KOffice in the longer run?