I don't think this is possible, but you never know, so here goes.
I'm in the process of doing a cutover migration (Exchange 2010 to Office 365).
We have some users who have created second calendars and then shared them to others in the organization.
I've checked through Powershell to make sure these additional calendars were migrated. They were indeed. I've permissioned them properly.
I have no doubt they can be opened in the Outlook 2013 client once we do the cutover, but I'm wondering if there's any way a user can open another user's second shared calendar, to which s/he does have permissions, in Outlook 365 ?
When selecting Other calendar to open and searching the directory, you just get users, which will open their primary calendar, not a second one they've created. I'm wondering if there's any way through Powershelll to automap that second calendar. Ideas ? Or just a no-go with Outlook 365 ?