We have an onsite Exchange server, we have a room resource that has been created and is opened as an other calendar in Outlook. When using Outlook 2007 we can add an event to the resource. When we log into the OWA we can see the event, and the calendar. However, when we try to add an event to the resource via OWA, the calendar is unavailable to select. You can see in the screenshot below the issue. testresource is listed in Other Calendars along with Radio, however it is not available in the calendar: drop down menu when trying to create a new event.
What is the Exchange Powershell command that will make other calendars available from New Event in the OWA?
edit: Permissions are identical between radio and testresource (testresource has even had the administrator added to full access.