Here's a long writeup by someone who worked at Microsoft at the time: https://www.nplusonemag.com/issue-19/essays/chat-wars/ https://www.nplusonemag.com/issue-1

Here's a long writeup by someone who worked at Microsoft at the time: https://www.nplusonemag.com/issue-19/essays/chat-wars/ https://www.nplusonemag.com/issue-19/essays/chat-wars/