Collaborative, integrated, encrypted and open source office suite
Use an already existing open source frame (like Cryptpad, OnlyOffice or Collabora Office/LibreOffice Online) to create an integrated and collaborative encrypted office suite.
Make it Open source from the very beginning and allow for the community to actively help the development and improvement of the project. Allow and encourage upstream contribution to the office projects.
(There are already three other ideas about an office suite (1. Cryptpad, 2. Onlyoffice and 3. LibreOffice. Merge the ideas into this one ?)

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xyz commented
Look into what Skiff was building before they were acquired. Their concept may be a good idea starter.
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Benjamin commented
+1. Proton, as great as they are, don't have the bandwidth to develop a comprehensive office alternative. And arguably, they shouldn't, because great OSS solutions like collabora online exist.
This particular set of featurse is the only critical bit preventing me from mobing all my cloud services to a proton unlimited, making alternatives that do support collabora very appealing, even when the companies behind are not as good as proton.
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Gburtech6 commented
This would be amazing. It would go a long way to making proton drive more competitive, and it would save Proton a lot of work.
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Igelgott commented
Huge opportunity into integrating LibreOffice into peoton drive
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Arnie commented
How about OpenOffice?
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Henry Dyck commented
I was just coming to comment this!!! It would make my decision to switch fully away from Microsoft much easier.
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trader mu commented
I've added 3 votes to your post and have my own thread on this here:
https://protonmail.uservoice.com/forums/945460-general-ideas/suggestions/48485528-proton-officeAdd 3 votes and vote it as critical so we can be heard! I want what you want!