It's not a popular opinion on HN but Microsoft really provides superior value with Office 365 [0]. Even though the quality or usability of their products aren't that great, it's good enough for most businesses, many which are too busy getting work done or just surviving rather than evaluating the latest collab/productivity darling that costs another 30-50 USD per employee.
[0] Zoho is the other alternative but even their offerings tends to become expensive once you start using more than a single app.