Outsider estimates on the size of the 3000 market are going to be flawed. By outsider, I mean the ones that come from analyst companies, such as the ones that IDC prepared in the 1990s and early 2000s. Nobody can really be sure where that data came from. You can only hope they've talked to firms who were actively selling HP 3000s.
Those companies didn't have an HP address. Most of the 3000s were sold through resellers and distributors. This was a small business solution, in so many cases. Not that there aren't servers running in places the size of Boeing. But for every Bullard — makers of the iconic hardhats with three ridges — there were three or more companies like Peerless Pumps, or even a good-sized but not giant company like Disston Tools.
For the 3000, though, it was never about the numbers of servers. The tally of companies was more impressive. A Unix shop could have a few dozen HP systems, because the nature of the Unix world was to dedicate a server to each application. A single 3000 could host many apps.
In searching for better data on how big the 3000 market might be, I reached out to Steve Suraci of Pivital Solutions. A 3000-focused company, Pivital sold 3000s and is among one of the freshest resellers of servers. Suraci said HP had a number which they used while describing the size of the market.