Can't open Discovery Search Mailbox

While I was playing about with Discovery Search, I had the issue that I couldn't open up the Discovery Search Mailbox with either OWA or Outlook.

I suspected it was a permissions issue, but I was already a member of the Discovery Management group and when I looked at the Full Access Permissions in Exchange Management Console I could see that group listed.

After much scratching of my head, I decided to dive into ADSIedit and have a look at that Mailbox.

I found the Mailbox under Default Naming Context > DC=Domain,DC=Name > CN=Users, CN=DiscoverySearchMailbox{blahblahblah}

and when I took a look, I saw that the Discovery Management group wasn't listed. I just added it back in and gave it full control and the problem was solved!

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