Backward Compatibility for Existing Mail Add-ons

Parallels Pro Control Panel supports mail add-ons that are based on the Mail API commands included in Ensim WEBppliance Pro 3.X for Windows 2003. This backward compatibility feature can be enabled using the 3.XCompliantAPI parameter while registering the mail add-on with the RegisterMailAddon command.

In backward compatibility mode, the existing mail add-ons are supposed to work as is with Parallels Pro Control Panel. Exceptions to this include:

  1. The new APIs will not work, since they are not implemented by existing mail add-ons. Parallels Pro Control Panel will throw exceptions in such cases.
  2. If the mail add-on assumes Ensim WEBppliance Pro 3.X environment, it may not work as is and might require some modifications.