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don’t forget that it uploads your non-microsoft email accounts’ passwords to microsoft so that they can steal your mails to their systems
https://www.ghacks.net/2024/01/12/proton-mail-says-that-the-new-outlook-app-for-windows-is-microsofts-new-data-collection-service/
Yep, it is straight-up malware. Just like most mail clients on Android and especially iOS. At least there they have the (terrible) excuse of doing it to save power by having their server push new mail notifications through the OS’ infrastructure instead of having the app wake the device up all the time.