How to delete recurring meeting that was created by an account that was deleted

Hello fellow spiceheads,

I'm trying to delete a recurring meeting that shows up on on of our resource mailboxes (meeting room). Problem is the creator of the meeting has left the company a while ago and the account was deleted.

I'm on Outlook 2013 / O365. I gave myself full rights to the resource mailbox and it shows up in my Outlook folder tree but when I click to open I get a message saying "Cannot expand the folder".

Any help is greatly appreciated.

Thanks!