While we were a division of SCO, SCO weren't that relevant to us. They bought IXI to ensure stability in supply of their desktop. SCO distinguished itself from other Unix vendors by having a friendly desktop including for administrators and their tools.

IIRC our business was something like 3% of sales on Intel chips with the rest being RISC, although SCO itself isn't counted in that since we didn't sell on the platform (corporate took the software and customized it to their needs).

SCO definitely considered Windows (NT) to be the competitor. However SCO was considerably cheaper than the RISC workstations and operating systems. The changing usage patterns are what led us into the browser space, into making Motif look like Windows so when displayed on Windows it wasn't jarring, and then our foray into letting you access any app via your browser which became Tarantella.

OSF (you didn't get the expansion quite right) was a pawn in the Unix wars: http://en.wikipedia.org/wiki/Unix_wars GUI issues in the Unix variants were the battleground in the early nineties, and finally petered out in the late nineties when Windows "won".

Our (IXI, not the SCO corporate parent) major product of the time was X.desktop which only ran on Unix systems using the X window system. ie it was Unix based apps to make Unix easy to use.

We then moved into "client access" which meant terminal emulators, X servers for Windows and file access (VisionFS) which were Windows based programs to make it easy to use Unix systems (except VisionFS).

Finally we did Tarantella which made it easy to use apps from just a web browser, and it was irrelevant if the apps were Unix or Windows.

Tarantella was eventually bought by Sun which was eventually bought by Oracle, but the product is still for sale. Some details at http://en.wikipedia.org/wiki/Sun_Secure_Global_Desktop (Disclosure: I was the architect for the non-gui protocol parts of Tarantella)

VisionFS is what I am most proud of - details at http://www.rogerbinns.com/visionfs.html