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Exchange 2013 Failed to Mount 6th Database An Active Manager Operation Failed
This is quite a common error but this one had a little twist. I had created a new Exchange 2013 organization and the client required 7 mailbox data stores. I mounted the first 5 then when I tried to mount the 6th and 7th I was greeted with the following error.
![Exchange 2013 Failed to Mount 6th Database An Active Manager Operation Failed](https://www.techieshelp.com/wp-content/uploads/2014/09/Exchange-2013-failed-to-mount-database-and-active-manager-operation-failed.png)
The error cause was staring me straght in the face, if we read the section MAPIEXCEPTIONTOMANYMOUNTEDDATABSES we can see its complaining about the 6th database. The reason I was having this issue was that I had not put the license key in for Exchange 2013. Out of the box unlicensed Exchange 2013 will only allow 5 databases to be mounted concurrently, which is normal for the standard edition of Exchange 2013.
If you would like to mount more than 5 databases then you will need the enterprise edition and this edition is again limited to 50 databases per server.
Tags: mailbox