@lyda@dangoodin Concur. In the 200Xs, I had 2-3 versions of ssh on business desktop (Hummingbird X, MKS TK, Cygwin) plus Unix&Linux vendors' ssh on servers. (I had MKS TK in '90s but did our servers do ssh? I fear mostly FTP or rsh/rcp still then alas.)
@BRicker@dangoodin thankfully I've never had to use Windows so dodged that problem. It was the original ssh and then switched pretty quickly to OpenSSH once it showed up on Linux. And FreeBSD, Solaris and HP/UX IIRC. Maybe Tru64?