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Derrick
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The BlackBerry Internet Service (BIS) is a service that provides BlackBerry smartphone users with access to Internet browsing, allows email messaging, instant messaging using the BlackBerry Messenger service, and more. The service also allows users to access POP3, IMAP, and Outlook Web App (not via Exchange ActiveSync) email accounts without connecting through a BlackBerry Enterprise Server (BES).
The service is usually provisioned through a mobile phone service provider, though Research In Motion (RIM) (BlackBerry's developer) actually runs the service. This service uses RIM's proprietary push technology (in contrast with SyncML-based push technologies such as Funambol) to the BlackBerry devices over cellular carriers. BIS retrieves email from mail servers by polling a POP3 or IMAP server and offers additional synchronization capabilities, such as calendars or contacts for some webmail providers.
Source: Wikipedia
The service is usually provisioned through a mobile phone service provider, though Research In Motion (RIM) (BlackBerry's developer) actually runs the service. This service uses RIM's proprietary push technology (in contrast with SyncML-based push technologies such as Funambol) to the BlackBerry devices over cellular carriers. BIS retrieves email from mail servers by polling a POP3 or IMAP server and offers additional synchronization capabilities, such as calendars or contacts for some webmail providers.
Source: Wikipedia