I wonder how many people haven’t realised that the new Mail/Outlook client, the one they’re pushing everyone towards in Windows, actually syncs all your mail to MS servers.
Yeah, Microsoft is trying to normalise the idea that your own personal email client should be open to them to access and steal your data so they can advertise at you.
Fuck windows and fuck outlook.
Thunderbird is free and entirely private on all platforms (And K9 mail on Android is also maintained by the Thunderbird team)
Also, I seem to recall my dad migrating to a new machine borking his email because of something like that. ( I didn't catch the details. he was grumbly and growly in ways only a unix admin could be.)