Recently made the switch to Proton Mail and Drive (partly to decouple from US-based Gmail and Outlook). So far so good. The system feels slick, fast, easy to manage. The free tier is very limited so upgraded so I can also use our family domain name. The apps are reasonable on iPhone (iPad less so). The only caveat on MacOS is you need to use the "Proton Bridge" app if you want to continue using Mail (or other email app) to work with the encryption. The Drive app works very well though. Only downside was a massive lack of e-mail and username availability, probably too late to the party. A few more domain extensions would help!
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