I wouldn't be surprised if Azure DevOps still pops up in random places for decades to come or if they decide to "unify" the two products without changing the underlying codebases (like OneDrive for business actually using Sharepoint under the hood).

Unlike Google, Microsoft seems to commit to legacy software to a fault. As long as there are enterprises paying good money for support, it'll probably not go away completely.

EDIT: Microsoft only stopped licensing OEM Windows for Workgroups 3.11 in 2008 (15 years after the first release of WfW 3.11). Apparently it was still being used by some embedded device manufacturers: https://docs.microsoft.com/en-us/archive/blogs/jcoyne/its-th...