Well a lot of departments in my company were already using Slack. ITS came to us almost 2 years ago and said, "we're not paying for Slack if we have access to Teams." And then they ran a year long pilot. So we've had lots of notice.This! I was fine with Business Skype and corporate let Teams take over without us knowing, so it caught us off guard. I hope we only use it for chat and calls. I'd rather keep Outlook for e-mails and scheduling.