Thanks for the request. Currently there is a way to set this property through powershell for groups, but it only works for users in OWA. We have this in our plans for Outlook desktop as well and will be working on it.
An error occurred while saving the commentMike Powell commented
To add another use case, I'd like to be able to expand permissions on a group calendar, to allow our whole organization to read a private group's calendar but only group members to edit.Mike Powell supported this idea ·