Troubleshoot Exchange Server 2007 Error Code 8206

Exchange Server 2007 users experience this error while adding calendar entries or saving appointment in it. This blog will talk about various reasons behind this error, its variant and also elaborate different relevant methods to resolve this error. Application based on custom MAPI or CDO which refers to Collaboration Data Objects of Microsoft Exchange Server 2007 are utilized for modifying the calendar items. But when user tries to save appointment an error is generated showing that calendar agent has failed. This usually happens if user has already saved many appointments or has made recurrent calendar entries. Following application event log is created after such error;

Here, error codes can be different which can have different resolutions. Most common error codes which are seen for such kind of error are; 0xfffff9bf&0x8004010f. Overall several other error codes can be seen with above mentioned event ids;

Root Cause: Root cause for such error is blocking of additional data. Usually a counter is incremented when you add or modify a recurring meeting. But this counter has a defined limit which is reached soon and once it is reached to its limit, further entries or modifications are blocked.

Solution: Microsoft provides a downloadable hotfix for this issue which can be downloaded and utilized. But this hotfix will only work if the cause of error is counter blocking of calendar entries. If any other issue is causing this error, this hot fix will not work. But it is suggested to go for this fix as a primary solution and if it doesn't work you can try below mentioned troubleshooting.

What Are Other Probable Reasons For Such Error?

In case the above mentioned hotfix does not resolve your problem, it is indicating to severe issue with Exchange calendaring. Another issue with error code 8206 can be that Free/Busy component of Exchange 2007 server is experiencing a problem to access Calendaring. It occurs when file-level scanner is scanning the Exchange IFS Drive (M Drive). The event ID can have several variations and each variant can have different error codes as mentioned above. These error codes which are Collaboration Data Objects (CDO) refer to bad data. It can also refer to authentication failures. So when are such errors occurred?

• It can occur if file-level virus scanner is performing scanning procedure to an installable file system (IFS) drive (M Drive).
• If in the Microsoft Windows registry, MSExchangeFBPublish key or associated sub-keys are missing from HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services. 

Actions To Resolve This Error Issue

• If any virus scanner is attempting to scan M-drive discontinue its scanning procedure. Calendars can be lost in such procedure or it can also get corrupted. You can restore calendars from latest backup available. In the absence of such backup, you can utilize Exchange Recovery software to recover corrupted calendars or even create same calendars again.
• You can try to restore the correct registry settings on you system. Perform this step carefully as any mistake while handing registries can overburden the situation.
• Check whether service account has the permissions to delete and retrieve messages in System Attendant’s mailbox.
• You can also contact Microsoft Customer Service & Support for this type of fix.