is it possible to share my Office 365 calendar with an external user WITH write permissions ?

We have our own domain and it is hosted on a Office 365 subscription. I know you can switch on calendar sharing for external users. They will receive a link with which they can consult you calendar and see busy/free times. But they cannot write in it.  I'm looking for a solution so that a non domain-member can read & write into my Office 365 Online calendar. Is this possible ?
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Vasil Michev (MVP)Commented:
To put it simply, no. No built-in methods for that, but you can do some web-based tool that writes to the Calendar via EWS or similar, put some access controls on it and so on.

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Jian An LimSolutions ArchitectCommented:
In addition,
If you are using Business Premium you can look into "Microsoft bookings", if not you need to wait
Jian An LimSolutions ArchitectCommented:
O365 do not have it by default, without involving other tools
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