Per default the calendars of shared mailboxes in Office 364 have “FreeBusyTimeOnly” permissions applied.
You could create a new sharing policy and change the applied policy on those accounts.
I however chose to just change the sharing permissions on the shared calendar.
The GUI at Microsoft is great but sometimes we need to dig a bit deeper.
I ran into some issues with a Resource mailbox and had to do some troubleshooting in the Office 365 service.
While you can perform granular assignments in Exchange 2010, there are also Predefined Role Groups that you can use if you want an easier way of assigning permissions to end users.
Adding an Additional Mailbox in Outlook 2013 is very similar to the process for Outlook 2007 and Outlook 2010…
Adding an additional mailbox to your Outlook 2010 profile is very simple as long as you know where to look.
Here’s a quick guide which explains how to set up an additional mailbox in Outlook 2007.