Innovation in Mobile Email
2 Website: www.blackberry.net
1997-2000 Research In Motion Limited
Innovation in Mobile Email
The BlackBerry solution introduces a number of innovations in mobile email.
1. BlackBerry has eliminated the hassles of dial-up by moving mobile email to a “push” architecture. In
the traditional “pull” model, the user periodically connects to the information to see if anything has
changed. In a “push” model, the information connects to the user – notifying them immediately of any
changes. When email arrives at the corporate inbox, a copy will immediately be “pushed” or sent to the
handheld.
2. Unlike other wireless email solutions, BlackBerry does not use a separate email address for the mobile
handheld. Mobile professionals have made it clear that they want access to their corporate email – not
a second mailbox.
3. Unlike current handheld mobile email solutions, BlackBerry provides a completely secure end-to-end
link between the corporate email system and the handheld.
Link to Desktop Email
Overview – Desktop Solution
The BlackBerry solution for linking the desktop and the handheld is elegant in its simplicity. Figure 1 on
the next page provides an overview of the system architecture. The key pieces of the BlackBerry solution
are highlighted in the diagram – the BlackBerry Desktop Software’s Redirector component, the RIM
Wireless Handheld and the BellSouth Wireless Data Network. Since BlackBerry supplies the software at
both ends of the link, implementing end-to-end encryption is simple. (End-to-end encryption is discussed in
a later section of this document.)
The general operation of the system is very simple. When mail arrives at the Exchange Server (A) for the
BlackBerry user, the BlackBerry Desktop Redirector (B) is then notified by the Exchange Server. The
Desktop Redirector retrieves a copy of the message, compresses and encrypts it and sends it via the Internet
to the wireless network (C). The outgoing message is an unreadable email that can only be decrypted at that
user’s RIM Wireless Handheld. The wireless network then delivers the message to the handheld (D). At the
handheld, the message is decrypted and decompressed and the user is notified of its arrival. For this email
redirection system to operate, users must leave their desktop computers running. (A password protected
screen saver is recommended for security.)
The path from the handheld to the desktop follows the same steps, only in reverse. When a message is
composed on the handheld, it is compressed, encrypted and sent back to the user’s desktop over the Internet
from the wireless network. Once retrieved from the server, the Desktop Redirector decrypts and
decompresses the message and places it in the Outbox. The result is that there is no difference between a
message that is sent from the handheld and a message that is sent from Outlook – they both originate from
the user’s corporate email address and a copy is placed in the user’s Sent Items folder.
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