I installed a new Exchange 2003 standard server that I am configuring as a front-end SMTP bridgehead server (running on Windows 2003 R2 Standard Server) that will be handling our TLS encrypted traffic. I installed Exchange 2003 along with SP2 and a few hotfixes. I have discovered that the first private mailbox store did not mount and the priv1.edb and priv1.stm files never were created. The public folder store exists and is mounted. When I try to mount the first mailbox store I receive the following error message: An internal processing error has occurred. Try restarting the Exchange System Manager or Microsoft Exchange Information Store service, or both. ... ID no: c1041724 In the application log, the following errors appear: Event Type: Error Event Source: MSExchangeIS Event Category: General Event ID: 9546 Date: 10/6/2010 Time: 1:13:33 PM User: N/A Computer: TGI-OWA5 Description: Failed to create the Event Registration Mailbox for Database First Storage Group\Mailbox Store (<server name>). Error - 0xbf69. For more information, click http://www.microsoft.com/contentredirect.asp. -- Event Type: Error Event Source: MSExchangeIS Event Category: General Event ID: 9519 Date: 10/6/2010 Time: 1:13:33 PM User: N/A Computer: TGI-OWA5 Description: Error 0x80004005 starting database "First Storage Group\Mailbox Store (<server name>)" on the Microsoft Exchange Information Store. For more information, click http://www.microsoft.com/contentredirect.asp. Data: 0000: 46 61 69 6c 65 64 20 74 Failed t 0008: 6f 20 63 72 65 61 74 65 o create 0010: 20 74 68 65 20 45 76 65 the Eve 0018: 6e 74 20 52 65 67 69 73 nt Regis 0020: 74 72 61 74 69 6f 6e 20 tration 0028: 4d 61 69 6c 62 6f 78 2e Mailbox. 0030: 00 . I tried restarting Exchange Services and rebooted the server a few times. I found a user under "Delegate Control" that was a SID only. I deleted it but that didn't help. I have been googling the problem and have found a few things like the "Delegate Control" suggestion but nothing has helped. Any ideas?Steve