You notice that Journaling and ESM are not processing any messages. After looking at the MailboxID-xx-yyyymmdd.log and DataLoaderID-x-yyyymmdd.log you notice the following error:
14:27:53 ERROR: MIMEHeaderParser.CreateInstance:
14:27:53 [80040154] Class not registered
You will also see similar errors in the Mailbox Scan Status page.
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