As a user, we used two Domino servers. One was Windows NT, the other was Linux. The Linux one was incredibly performant compared to the Windows one. I think it was an example of good reimplementation using hindsight.

In a past life I was a Domino admin and I ran it on an AS/400. It was great, handled incredible amounts of load, and required little maintenance. The only outage we had was when I accidentally deleted all the databases from the file system. Even that was pretty easy to recover from.

It was. I did some I.T. consulting in the Fortune 500 and a few ran Notes on the AS/400.

I had an AS/400 but unfortunately never got to run it on that. (it was a JD Edwards server for the ERP system)

Nope it was on good old winNT 4

I think we may have upgraded it to windows server 2000 at one point as well.

I remember that the disk partition it ran on ran out of disk space once.. it kept ticking along. just didnt let users make changes. Amazing stuff.