How to delete store event sinks
If you want to delete the event sink you registered in a particular mailbox, you can perform the following steps:
1. Start the command prompt, and change to the directory where the regevent.vbs is located.
2. Type the command to run regevent.vbs. The following code is one example of the command:
cscript regevent.vbs delete "file://./backofficestorage/contoso.com/MBX/smith/inbox/testsink"