Symantec Encryption Management Server Web Email Protection Complete customization and Advanced customization templates may not work as expected after the server is upgraded to a later release, even if no errors are displayed.
Advanced and especially Complete customization templates enable administrators to make extensive changes to the Default Web Email Protection template. Depending on the complexity of the customization, such templates may not work as expected in a newer release.
Simple customization templates can be expected to work as expected in a newer release.
When Advanced or Complete customization templates are used for Web Email Protection, please be sure to test the impact that the upgrade will have on the template in advance.
To minimize risk, it is safest to do the following: