Plenty of potential here; I've been gently researching it with a view to my own TL as well.
One potential might be the AIM alliance being more successful (Apple-IBM-Motorola). It was formed in 1991. Here we say that negotiations become more successful, and the negotiations around the reference platform are successful; a parallel port is ditched and a Firewire port included instead for external connectivity, but IBM's OS/2 is plotted as the main OS to be preinstalled on PowerPC units (except Apple products). Now we have a clear and stable reference platform, and operating system from the launch. OS/2 is renamed as OS/3 for the launch of the new platform, and enables Windows application compatibility as well (OTL: OS/2 Blue Spine) as well as being a full 32bit operating system with a graphical user interface.
IBM's PowerPC products (let's call them the IBM "Aptiva" range) is heavily pushed by IBM into business environments where IBM remains a trusted name. Apple push their PowerPC based range into the home enthusiast range, under their "Macintosh" label. The two-pronged approach dents Intel's efforts to become dominant, and despite Microsoft's Windows 95 achievements, it fails to dominate in the business market where IBM & OS/3 are holding some 2/3 of market share - primarily due to IBM's efforts to cement themselves in position by offering Aptiva workstations, servers, mainframes and software offerings (such as Smartsuite and Notes for office productivity). The included Firewire interface is also regularly used in server rooms as a fast server-to-server interconnect.
Novell later join the alliance, filling the last remaining position that AIM had failed to fill; that of network management with it's Netware systems. Netware, in the face of waning standalone popularity, and it's growing dependence on integration with OS/3, joined the alliance as a first step to Netware-OS/2 integration. Netware largely functioned as OS/3 management - the eDirectory services proved popular in business as a user management tool and method of file/print sharing, and was the first move in IBM's acquisition of Novell's intellectual property, whose share price was plummeting.
Microsoft, while popular with millions of home users, continues to invest in it's networking abilities and announces it's intention to produce "Windows 2000" as the latest incarnation of it's Windows NT lineup - it's version of Windows for businesses, with several new features. The move was it's final gambit in the business market, and proved to be a flop as it never recouped the investment Microsoft poured in to it.
OS/3 and Macintoshes were now popular in the home environment to; Apple appealed to the "cool kids" and enthusiasts, while corporations and suburban parents usually had an IBM machine in the study for work, study and internet.
Microsoft's failed Windows 2000 efforts leave the company as a home user budget operating system; usually popular in developing markets. It is better known now for selling several well known pieces of non-operating system software that are compatible on all three operating systems; MacOS, Windows & OS/x.
The original AIM alliance, under threat from antitrust authorities, now breaks up - it's original purpose of breaking the dual threat of Intel and Microsoft now complete.
The intellectual property now sits in "AIM Inc", who licenses the hardware design and CPU designs to CPU manufactures such as IBM and Motorola (although Cyrix are now a third, niche, manufacturer).
IBM's NOS series (now at NOS/10, marketed as NOS: Vista) is the dominant operating system. The addition of 'N' for networked (or Netware as some ex-Novell employees like to say) brought IBM's operating system fully in to the online world, integrating it in to it's base.