Calendaring agent failed with error code 0x8000ffff while expanding recurring appointments. This is coming from EXCDO with ID code of 8208. I am getting a ton of these errors and I am not sure how to correct this. It seems to be tied to this error as well. ID10016 The application-specific permission settings do not grant Local Launch permission for the COM Server application with CLSID {9DA0E106-86CE-11D1-8699-00C04FB98036} to the user NT AUTHORITY\SYSTEM SID (S-1-5-18). This security permission can be modified using the Component Services administrative tool.The application-specific permission settings do not grant Local Launch permission for the COM Server application with CLSID {9DA0E106-86CE-11D1-8699-00C04FB98036} to the user NT AUTHORITY\SYSTEM SID (S-1-5-18). This security permission can be modified using the Component Services administrative tool. Any ideas?

This is an exchange 2007 server with migrated mailboxes... Thanks

Hi, Do you have Exchange 2003 and Exchange 2007 in mixed mode? Do the exchange users report any problem relating to calendar? This error happens if users cannot retrieve the calendar information (such as free/busy information) from exchange server due to the permission issue. To troubleshoot this problem, please perform the following steps: 1. Go through the application logs to find if it is coming for only one user or for many. 2. Added replica of schedule + freebusy folder on Exchange Server 2007: http://support.microsoft.com/kb/945602

It is happening to numerous users and we set for 2003... trying kb article now. Thanks

[PS] C:\Documents and Settings\admin>get-publicfolder -Identity "\NON_IPM_SUBT REE\SCHEDULE+ FREE BUSY" -Recurse | fl name,Replicas Name : SCHEDULE+ FREE BUSY Replicas : {} Name : EX:/o=acme/ou=Exchange Administrative Group (FYDIBOHF23SPDLT) Replicas : {Public Folder Database} Name : EX:/o=acme/ou=First Administrative Group Replicas : {Public Folder Database} Looks like the proper replica's are there. could there be a dcom rights issue?