alt Hacker NewsYou don't want a drop-in replacement for each service, you want one for the entire system.
Microsofts advantage is ActiveDirectory integration. Centrally managed users and machines, every user, every application, every service authentications through the AD.
Organizations opt for Teams all the time, because it's part of the package and fully integrated. There's no reason they couldn't pick something else, but why deal with it when Teams just work (sort of).
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Is there a combination of open standards to drop in to replace AD integration with self management?
OAuth enabled systems aren’t enough, central management of users and machines are huge. If that core matures, it opens up the market for replacements in other areas. Teams, Outlook and the Office Suite need first grade replacements.
And OpenDesk has managed to do without, they seem to be using Univention Nubus as an AD Replacement
https://www.univention.de/loesungen/alternative-zu-microsoft...