I'd like to add on that I am currently using the old Blackberry Hub for Android, on my work phone and it is a much much better way that unfortunately doesn't play with Proton Mail. If OTOH Proton could put all mail and calendar in to one Hub - not only Proton products, but allow me to read and respond to work and personal accounts and manage work personal and family shared calendars - I could justify asking work to help fund, and maybe even also my spouse. TO my understanding this requires Blackberry hardware and independent servers however.
I'd like to add on that I am currently using the old Blackberry Hub for Android, on my work phone and it is a much much better way that unfortunately doesn't play with Proton Mail. If OTOH Proton could put all mail and calendar in to one Hub - not only Proton products, but allow me to read and respond to work and personal accounts and manage work personal and family shared calendars - I could justify asking work to help fund, and maybe even also my spouse. TO my understanding this requires Blackberry hardware and independent servers however.