Circa 1987 I had an after school job at the NYC Board of Education at 110 Livingston Street - this location had a computer lab that taught teachers. It was filled with IBM PC's, Apple II's and Macs. There were also other assorted things like Commodore Plus 4's and so on in storage.
One day there was this huge machine that looked like a double sized Mac Plus sitting in the trash area. I asked my boss about it and he said "The Lisa? Sure, take it. Oh and here's the hard drive for it" After a few weeks the power supply died, and I brought it back to work, my boss ordered a replacement for me. I also got MacWorks and installed it on it. A few weeks later, word got out that I took that Lisa, and another teacher in Brooklyn was getting rid of two more of them that were broken.
Of those two, I was able to move parts around to get one working. Sadly, I threw out the chassis for the other one, there must have been some short or other in it, as it would always fail to power on. I kept the cards and guts. Some time later someone in Yonkers had three dead ProFiles - he said likely the media was likely damaged and he couldn't get them working at all with his Apple ///'s or ]['s, but when formatted in the Lisa, they worked fine, though a couple of them sound like jet engines.
At some point on the early internet or more likely a BBS, I ran into Steve Hatle who informed me that there's yet another OS on it and it's historically important, and that's how I got into Lisa Office System. Around this time, I was also getting into learning Unix, and getting Xenix running on the Lisa, though extremely slow, served nicely.
At this point, I had built a IIcx Hackintosh in a 286 PC case, power supply, Applied Engineering superdrive, quantum scsi drive, and an Apple video card. The Lisa was only for Xenix for a year or so. The IIcx was from an upgrade to a IIci, that mobo was supposed to be shredded, but instead I got my hands on it...
Then early 1998 when doing my yearly turn on, patch, and testing of all my machines, I noticed both my Lisas were broken. SumRem was still around then, so I bought some spare power supplies and an I/O board and got them working again, but that's when the idea struck that there's no more Lisa's being made and at some point there won't be any more spare parts, and so the idea for LisaEm was born. By this time the internet had started up (the web around 1993 or 1994), but I had asked around and somehow someone pointed me to David T. Craig who had collected tons of Lisa documentation, and had been programming on LOS for years, and that's how LisaEm got started.