
Book VI
Chapter 2
Managing
BlackBerry Devices
457
Understanding BlackBerry
main purpose of BES is to act as an interface between e-mail servers
(most often Microsoft Exchange Server) and the BlackBerry NOC. Simply
put, BES monitors all activity on a user’s Exchange mailbox and sends
periodic updates over the Internet to the BlackBerry NOC, which relays
the updates to the handheld device via the cellular network.
As a network administrator, BES is the critical piece in the BlackBerry
puzzle. Most of the time you spend administering BlackBerry users will be
spent in BES. Here are some additional details you should know about BES:
✦ Although it’s possible to run BES on the same computer that you run
Exchange on, this configuration isn’t recommend. Instead, BES should
be run on its own, dedicated, server computer.
✦ A free version of BES called BlackBerry Enterprise Server Express is avail-
able for smaller systems with fewer than 75 handheld users. For larger
organizations, you’ll need to purchase the Enterprise edition of BES.
✦ BES works like a client as far as Microsoft Exchange is concerned. BES
logs on to Exchange using a special account called BESAdmin and uses
this account to access the data in BlackBerry users’ mailboxes. BES
retrieves the data from these mailboxes and then sends it over the
Internet to the BlackBerry NOC.
✦ For BES to work, you must grant the BESAdmin account full mailbox
rights for each BlackBerry user. Without this right, the BESAdmin
account won’t be able to access the BlackBerry user’s mailbox.
✦ To connect a BlackBerry handheld device with a BES server, you must
go through a process called Enterprise Activation.
✦ BES uses sophisticated encryption techniques to ensure that the data sent
over the Internet to the BlackBerry NOC and then from the BlackBerry
NOC to the handheld is secure. Thus, you can be confident that no one
can intercept your Exchange data as it travels from your Exchange server,
through the Internet, and over the cellular network to your BlackBerry.
One final note before I get into the details of working with BES: It was developed
at a time when the bandwidth capacity of cellular networks was very limited. As
a result, BES goes to great lengths to optimize the delivery of data over the cell
network. Where this becomes most evident is in how BES handles attachments.
Instead of sending the attachment directly to the handheld, BES creates a com-
pressed JPEG image of the attachment and sends the image. Initially, this image
is scaled to keep the file size as small as possible. Even this small image is sent
only when the BlackBerry user requests it. The viewer built in to the BlackBerry
handheld includes the ability to zoom in for a closer look at the image. When
the user zooms in, the handheld requests a more detailed JPEG rendering of the
attachment. BES then creates and sends the requested detail.
This arrangement may seem cumbersome, especially with the high-capacity 3G
cellular networks that are available in many areas now. But it is very efficient.
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