I'm a little new to Exchange, but I have several Shared Calendars (mailboxes). One of them is used for vacation scheduling. I have two owners listed: myself and the local administrator for that location. Everyone else is a member. Several members have complained that they cannot add an appointment to the shared calendar in Outlook (the option is grayed out). When I open the same calendar, I have appointments as an option. Did I do something wrong when I set it up? I thought I had followed the correct procedure by creating a Distribution Group; making it a security group; adding the members; and finally using the Office 365 Shared Mailbox Tool to create the mailbox. I had the members add the calendar by using Open Shared Calendar in Outlook. I haven't used any powershell scripts to modify the permissions.
Any suggestions?