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Re:Ask HN: Why is Microsoft Teams still so bad? by prpl on Wednesday September 21, 2022 @11:55PM (#32934637)
Trillian before that
Re:Ask HN: Why is Microsoft Teams still so bad? by maturz on Monday September 26, 2022 @04:40AM (#32980790)
Pidgin (called Gaim) released December 31, 1998 https://en.wikipedia.org/wiki/Pidgin_(software)

Trillian (propritary) released July 1, 2000 https://en.wikipedia.org/wiki/Trillian_(software)

Re:Ask HN: Why is Microsoft Teams still so bad? by seesaw on Thursday September 22, 2022 @01:28AM (#32935088)
and ICQ long before that …
Re:Ask HN: Why is Microsoft Teams still so bad? by maturz on Monday September 26, 2022 @04:42AM (#32980803)
ICQ is not the same thing, that one used a single protocol. Pidgin/Adium/Trillian was able to talk with ICQ users and others without installing several applications.