> As Vivaldi Mail supports IMAP and POP3 And there was me hoping for Exchange-Sync support for Microsoft 365 email integration, to release the local reliance on Outlook 365 which gets worse with every revision :(
Doesn't Microsoft 365 support POP3? My workplace uses that horrid mess called Microsoft 365, Office 365 or whatever name it has today, and its Outlook, but I can retrieve the emails from GMail connecting via POP3. But I don't know if you're looking for some more advanced functionality (not much of an expert in email, I just did the first thing I found to be able to process my email in a tolerable UI, it worked, so I…
Once you've experienced all three working seamlessly on a mobile phone against Exchange (Online or on-prem) you realise how fragmented other 'Mail' sync systems are.