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Sure can. The Microsoft plan allows you to ungoogle yourself.

Get a @your-domain-name email which comes with the same corporate outlook with calendar integration and everything else that comes with it.

Also, 1 TB.

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Another good option is Apple - they charge reasonably 0.99$ for 50 GB

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Finally, dropbox is really good too and I have been using them since the beginning.

Theoretically you can. You just need 6 different email addresses and add them to your onedrive account. You won't be able to use it as a single 6TB volume though.

I don't think you can use 6TB on a single account, you would probably need to create multiple accounts.