[gerdesj]

You'll recall how horrendous on prem Exchange updates could be. Surely the sheer amount of time involved was a nudge and nothing technical?

My tiny company had an on prem Exchange, migrated from GroupWise, and is now cloudy. I did all the migrations myself.

I have left things with our MX records pointing to on prem (Exim + rspamd + stuff) and relaying to MS 365 and a few IMAP daemons. If MS take the piss with licensing costs, I'll simply relay elsewhere and drop them.

Then I'll migrate my customers away. It'll take a while but it is not insurmountable.

FWIW: I use Evolution on my Kubuntu based gear to access M365 email. Wifey rocks Arch and I've deployed Evo on KDE there too.