Nobody (sane) was putting a C64 in an office.

The competitor to the Lisa didn't really exist yet. Closest would have been a Xerox Star Office system or like the other poster said, one of the various dedicated word processing / office systems like the Wang, etc. and they were even more money.

People were wedging Apple IIs into service in the office, but they weren't exactly cheap, actually, and they couldn't do much.

The IBM PC was just starting to take over here, but it clearly couldn't do what the Lisa or the Xerox Star were trying to do; WYSIWYG, etc. Visi Corp, Microsoft, and DRI were all trying to ship GUI office systems for the PC, but they hadn't made anything compelling yet.

It was another 3-4 years after this before Mac or PC systems were powerful enough to handle full GUI office automation, and another 10 before they really took over those kinds of function.

In the end though Apple (and Xerox) was grasping after a market which didn't really long term exist. The "paperless office" market and office automation didn't end up shaking out like this. MS-DOS PCs + Novell NetWare, etc. did have a niche for a bit though.