Kontact, KDE's set of utilities that helps you manage your email, calendars, contacts and more, has received more than a 1000 improvements just in the last two months. Developers are also working on porting Kontact to Windows.
https://www.volkerkrause.eu/2021/01/06/kde-pim-november-december-2020.html
@kde Until today I thought Kontact would only manage contacts - Screenshot looks good.
@kde This is really good news! Has Wayland support improved? I remember that using KMail on Wayland was always impossible…
@kde Can you get an O365 account working in it?