I’ve worked at 2 companies who used Google for email and calendaring but still relied on O365 (one of the many naming incarnations) for Word, Excel, and PowerPoint. Microsoft really do have quite a mindshare foothold in the office productivity market.

Last big corp I worked for had a half-half setup of Outlook for email (and you were reminded that messages are retained for 7 years) and used Zoom+Slack instead of Teams (it was disabled, so not even an option), but we did use Sharepoint.