*Bulletin ID* A2E_174
*Last Review* 04/04/2008
*Revision* 1.0
*Previous IDs* None
*Obsoletes* None

ERROR: EXCDO 8206 Calendaring agent failed with error code 0xfffff9bf while saving appointment


Synchronization of recurring appointments can result in the Microsoft Exchange Information Store no longer being able to process recurring meetings. The issue appears after an extended period of synchronization and is temporarily fixed by restarting the Information Store. Microsoft has identified an issue with Exchange and has issued a hotfix. DidItBetter Software has also identified and resolved related synchronization issues with recurring meetings and has implemented a fix with Add2Exchange 5.2 and later

See our more current updated Link and Related Article:  http://support.diditbetter.com/kb/a2e_189.aspx


The Microsoft hotfix is available at:


Add2Exchange 5.2 can be downloaded at:



Recurring meetings stop synchronizing. In Microsoft Outlook and Outlook Web Access, recurring meetings cannot be manipulated.

The following error appears in the Application Event Log after an extended period of synchronization (without a reboot or restart of the Information Store):

Event Type:   Error
Event Source: EXCDO
Event Category:      General
Event ID:     8206
Date:         2/26/2008
Time:         12:44:44 AM
User:         N/A
Computer:     X2003-SBS-63
Calendaring agent failed with error code 0xfffff9bf while saving appointment.

The error is can be preceded by numerous instances of the following warning.  Microsoft's knowledgebase indicates that this warning, by itself, can be safely ignored.  This warning does not go away after installing the Microsoft hotfix for the preceding error. The
Event Type:   Warning
Event Source: MSExchangeIS Mailbox Store
Event Category:      Views
Event ID:     1173
Date:         2/26/2008
Time:         7:27:45 AM
User:         N/A
Computer:     X2003-SBS-63
Error 0x6bb deleting unused restricted view from folder 1-AD38B on database "First Storage Group\Mailbox Store (X2003-SBS-63)". Microsoft Exchange Information Store will try to delete the view again at the next maintenance interval.

The following error also appears in the Add2Exchange event log when the problem is triggered. 

If you find this error in the Add2Exchange Event Log, check the Application log for the presence of the EXCDO error log originally shown.

Event Type:   Error
Event Source: Add2Exchange
Event Category:      None
Event ID:     1004
Date:         2/26/2008
Time:         9:35:19 AM
User:         N/A
Computer:     X2003-SBS-63
Add2Exchange Synchronization FAILURE source message: Recurring 100 of Relationship: Public - Calendar Source To 1000 - Calendar



This WAS an unintended limitation in the way Exchange handles copies of recurring meetings identified by Microsoft. The Microsoft hotfix removes the limitation. This hotfix is not a part of Microsoft Exchange updates as of the time of this writing and must be specifically requested via the hotfix link.

Add2Exchange 5.2 and later have been modified to minimize the number of copies of recurring meetings to mitigate this issue. This does not prevent the issue from occurring, it simply extends the time of correct operation before failure. It is highly recommended that you upgrade to the latest version of Add2Exchange if you are experiencing this issue.


See our more current updated Link and Related Article:  http://support.diditbetter.com/kb/a2e_189.aspx 

Stop the  Add2Exchange Service. 


Applies To

  • Exchange 2003 up to and including SP2
  • All Add2Exchange versions

Keywords: EXCDO, Add2Exchange, Exchange, hotfix

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