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Storage is far from the highest priority. I do store quite a bit of files for marketing but those only need to be accessed by a few people.

Also, much as I wish otherwise, very little happens via email in this business. It's all chat apps now.

The important part is cross platform real time communications, calendar, and office. Some kind of kanban board is a nice bonus.

Synology does all that, they even have some kind of office suite (haven't tried, I would just use libre and a central storage)

Synology is also setup and keep running for years usually.

It's just an example tho. I just don't see any need for a Microsoft cloud solution for a small company (or anyone really)

There's a demo on their website: