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Don't forget MSN Messenger was discontinued/merged into Skype. So they fucked it not once, but twice. Literally handed over their dominant position in instant messaging for nothing.

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Wait - what about MS Lync/Office Communicator? I don't remember if that was just a branding change of "MSN Messenger for Business" about the time right before the Skype acquisition, or folding in (and failing with) yet another IM/Video chat solution. So should the count actually be three?

That's Teams. MS Lync was rebranded as "Skype for Business" which was then rebranded as Teams.

Yeah, it's actually three, though only from a branding perspective. They did rebrand Lync/Office Communicator as "Skype for Business" for a bit, though I don't think there was ever any code shared and it was just a branding thing.

Honestly I think they simply don't care, and from their perspective they finally have gotten it right with Teams.

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