And to make this thread even more off-topic, OS/2 tended to be the first operating system former Amiga owners looked at when they felt forced to migrate to a PC in the early-mid 1990's.
I think it is a good move by the moderators to include a sub-category for 386 and 486 computers. Those offended by the thought of a 486 as vintage don't have to read it, and those newbies who consider anything older than two years obsolete will at last find an on-topic place for discussing what they figure is "very old". It also bridges how 68040 based Amigas, Atari TT/Falcon, Macintosh etc have been on-topic for years, but 80486 PCs have been off-topic. Sometimes, people even post about early PPC Macintoshes in that subsection, which strictly speaking is just as out of the forum scope as early Pentiums are.
As other people indicated, this forum is a bit of jack of all trades, and I'm sure for almost every topic presented here, you could find another forum, mailing list, newsgroup or other expertise that specialises in exactly that topic, but in which every other subject would be off-topic.