"Unable to obtain server DN for user" Errors Generated by the Archive Manager Data Load Service (4210805)

The Archive Manager Journal mailbox is increasing in size and Event Viewer errors similar to below are reported:

System.Exception: Unable to obtain server DN for user 'casarray//o=Contosa/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=ArchiveMgr Journal' from database

The ArchiveMgr_Journal mailbox has been deleted from the Archive Manager website. The server name in the MAPI Data Loader is incorrect.

Resolution 1

1. Open the Archive Manager website and select Administration.
2. Select Data Loaders and edit the properties of the MAPI Data Loader.
3. Enter in a valid Server name and User ID for the Journal mailbox (preferably use the Legacy Exchange DN which can be found via ADSIEdit.msc).
4. Click Update and restart the Archive Manager Data Load Service.

Resolution 2

1. Run the following SQL query in SQL Management Studio on the SQL server for Archive Manager to determine the MailboxID of the journal mailbox which has a status of "deleted":

USE ArchiveManager

SELECT * FROM mailbox WHERE deleted = 1 and name like '%journal%'

1. Run the following SQL query in SQL Management Studio on the SQL server for Archive Manager to "undelete" the journal mailbox, replace XX with the correct mailboxID obtained in Step1:

USE ArchiveManager

UPDATE mailbox SET deleted = 0 WHERE mailboxID = XX

*Ensure an up to date backup exists of the Archive Manager SQL database exists before following the SQL steps above