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One of the "big Mistakes" was not pursuing Sun Linux (and yes, Sun Had it's own ground up built, Linux) and modestly priced desktops. The primary reason for not pursuing Sun Linux was because the Solaris group complained it would damage the x86/64 version. This was about 2002 When the first alpha versions of Sun Linux came out. Making it magically disappear and then denying it ever existed was one of my many missteps Sun made in its road to the graveyard.
I could document a good chunk of them but I don't have the time. I don't think anyone does.
This poster is spot on. I started with a SPARC 2 and progressed in a similar fashion.
I had a SPARCstation 5 on my desk in 1997. I took an SBus graphics card out of another machine. It would boot just fine without it. Then I put it in my SS5 and connected a second monitor. People around me thought it was amazing that I could have 2 monitors on the same machine.
We got a few Ultra 2 machines and then an Enterprise 450. I still remember being so excited when it arrived on a palette and when we unboxed it it came with 2 wooden ramps that attached to the palette so you could roll it down to the floor.
One engineer got an Ultra 60 as his desktop but by 1998 we started replacing most desktop machines with Linux / x86 and running everything remote and displaying to our local machines via X11 with the Suns in the closet. We also had a Sun Enterprise 4500 with around 16 CPUs at the main office.
By 2003 we started replacing our Suns with AMD 64-bit machines and Linux. All of our semiconductor design software was already Unix / X11 so it was easy to port to Linux. Around 2004 the switch was complete and we never used Suns anymore. They just fell behind the price / performance curve and couldn't compete with Linux / x86-64 anymore.