Calendaring agent failed with error code 0x8000ffff while saving appointment

Hello,

We've been experiencing event ID 8208 in the application log and event ID 10016 in the system log:

8208: "Calendaring agent failed with error code 0x8000ffff while saving appointment" in the application log and event ID 10016:

10016: "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"

After some invesigation it appears the setupof Policy Patrol installs parts for Kaspersky antivirus scanning even if you have not purchased the product. To resolve this run regedit and delete HKEY_CLASSES_ROOT\lk.auto, once deleted resatart your exchange server and the errors should go away.