The car it's attached to isn't the newest or nicest in the parking lot, but it's good enough for somebody. And you can be pretty sure that it costs less to keep that clunker running for six months than one car payment. That's Microsoft's problem these days.
Upgrades are down.
Many customers have found a version of Windows or Office that's good enough. It's not the prettiest or most current, but that clunker does the job. There's no compelling reason to upgrade, so they don't. Aw, that's too strong. Under current deals, once the agreement expires, the customer can keep using the software forever.