Comment by layer8

They have enterprise users locked in mainly due to Active Directory, for which there is no good replacement, and to a some extent SharePoint. There's also Office, of course, and you are right that the migration to web tech isn't well taken. I'm thinking of "New Outlook" in particular. They probably plan to EOL classic Outlook when Office 2024 EOLs in 2029. The last stronghold will be Excel. If native Excel ever gets discontinued, then everything Microsoft will have been webshittified™.