Use the MOMCertImport tool to edit the registry and remove certificates that have been imported.
|Incorrectly editing the registry can severely damage your system. Before making changes to the registry, you should back up any important data.|
To remove a certificate that was imported with the MOMCertImport tool
Log on to the computer with an account that is a member of the Administrators group.
On the Windows desktop, click Start, click Run, type regedit, and then click OK.
On the Registry Editor page, expand HKEY_LOCAL_MACHINE, expand SOFTWARE, expand Microsoft, expand Microsoft Operations Manager, expand 3.0, and then click Machine Settings.
In the results pane, right-click ChannelCertificateSerialNumber, and then click Modify.
In the Edit Binary Value dialog box, select the binary data, and then press Delete.