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My understanding is roughly, for example:
- Microsoft Word desktop application: not SAAS.
- Microsoft Word online: SAAS (just like any other service accessible by browser but not a “localhost”)
- Onedrive: SAAS, storage with local explorer integration.
- Exchange server on prem: not SAAS, increasingly diffucult to do.
- Exchange server by MS: SAAS
- Microsoft Outlook Classic for desktop: not SAAS.
- Microsoft Teams for desktop: SAAS although local install but its just another frontend instead of browser.
- Office365: SAAS but really a container for every tool in the MS online toolbox together.
Some caveats: Word handles spellchecker in their cloud and clippy 2024 (Copilot) integration blurs the line.
Isnt CAPSLOCK case for screaming? 😁