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What is the open source alternative to Office365? 'Regular' Office is becoming more and more rare.

Which is a shame, between the licensing costs, having to re-download or re-install the desktop apps, having to deal with OneDrive, etc.

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Hm, depends what part of Office 365 you need, the offering is truly gigantic. If you need something like Word Online, there's some stuff floating around (search "open source google docs" to find them). As for the rest, Exchange Online, Sharepoint, especially how it's all integrated, I'm afraid there's simply no alternative.

Nextcloud offers some integration in that regard.

I'd say a combination of Nextcloud together with Collabora Office.

Collabora is quite nice, but also complicated to setup (at least last time I tried, could be true only at individual level too). OnlyOffice has less features, but that also makes it simpler to use and deploy.

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