Event ID - 2078

Event Id2078
DescriptionUnable to submit, send, or transfer out a message. Check PR_Recipient_Number, PR_Recipient_Type, PR_Report_Type
Event InformationWhen you use Microsoft Outlook Web Access (OWA) to access a mailbox on a computer that is running Microsoft Exchange Server 5.5, OWA may stop responding.
Additionally, when you use a third-party program that uses Collaborative Data Objects (CDO) to access a mailbox on a computer that is running Exchange 5.5, the third-party program may stop responding.
When the third-party program stops responding, the above event may be logged on the mailbox server that is being accessed through OWA
This problem occurs when you try to access a user account that was previously accessed by a client computer that is running Microsoft Office Outlook 2003.
Outlook 2003 adds a fourth entry to the PR_FREEBUSY_ENTRYIDS property. PR_FREEBUSY_ENTRYIDS is a multi-valued MAPI property that is stored on the Inbox folder. CDO expects three entries. The unexpected fourth entry causes heap corruption that causes OWA or the third-party program to stop responding.
Hotfix information
A supported fix is now available from Microsoft
Reference LinksOutlook Web Access Stops Responding When You Try to Access a Mailbox on an Exchange 5.5 Computer

XFOR: IMS Does Not Send NDR for Messages Passed From a Custom Routing .Dll File with DISP_NDR_ORIG

XADM: Unexpected Event ID 2078 in Application Event Log Occurs When a Client Has Multiple Transport Providers

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