BIS is the consumer offering from Blackberry - so designed to work with the likes of Hotmail and Gmail. It provides email only support and does not offer over the air sync of calendar and contacts. It does not offer folder support..
It offers the following reconciliation services for the inbox - Email reconciliation features for the BlackBerry Internet Service
Without BES or BESx they will need to use Blackberry Desktop Manager to sync their contacts and calendars.
The Enterprise Activation only applies when used with a full BES or a BESx server.
