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As an Office 365 Home subscriber, all of the 5 outlook.com accounts associated to my office 365 home profile have been "freely" upgraded to Outlook Premium : no more adds on the right in the webmail + a "manage outlook premium" option in the webmail menu (that leads nowhere BTW) + a boring email link checking feature.
It matches the information given here https://blogs.office.com/en-us/2017/10/30/premium-outlook-com-features-now-available-to-office-365-subscribers/
However, I still cannot send a message "from" all my secondary MS aliases in Outlook 2016 (version 1710 build 8625.2132).