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Sharing Office 365 Calendar with External Users

Hi Experts

My Client wants to be able to share his Office 365 (Plan E3) Calendar with external, trusted, users that do not have Office 365.

On my own Office 365 (also E3) I have enabled Calendar Sharing as per this article. I have then added my external icloud (@me.com) address within the Outlook 365 Web App.

In my @me.com mailbox I get the invite:
1---invite.JPGI click on the 'Accept and view calnedar' button, it asks me to log in, I used the MS Live ID I have that matches my iCloud email address and I get:
2---error.JPG
Is this even possible?

Thanks
Mark
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Most Valuable Expert 2015
Distinguished Expert 2019
Commented:
You cannot use this method to share with unauthenticated (non-Office 365) users. It only works for O365 ones, and specifically with ones that allow the intra-org sharing.

Calendar Publishing is something that might work in your case: https://support.office.com/en-us/article/Turn-on-calendar-publishing-so-people-can-share-information-eb432e21-aaf0-466b-bf85-cefec0c7c4fc

However, it's read-only, no edit rights can be granted.