There is a need to extend EAS functionality, which covered by Exchange ActiveSync standard:

1. Need of additional EAS features on SmarterMail as they are available from 2.5 version of EAS standard. It is about client mobile device synchronization security requirements: screen lock protection by password, device encryption (e.g. restrict synchronization with mobile device, which does not met security requirements like device screen not protected by password or if it not encrypted);
2. Need a possibility manage remote wipe of mail users data via administrator’s interface. Now it managed by user, but not by administrator.

Further information about Exchange ActiveSync features you can find in Wikipedia.