Blackbe;rry Enterprise Server 4.1 User manual

BlackBerry Enterprise Server for
Microsoft Exchange
Version 4.1 Service Pack 6
Technical Note: Impact of Supporting HTML and Rich-content
Email Messages
©2008 Research In Motion Limited. All rights reserved. www.rim.com

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Overview
BlackBerry®Enterprise Server version 4.1 SP6 supports users sending and receiving HTML and RTF
email messages using BlackBerry devices that are running BlackBerry®Device Software version 4.5
or later. By default, support for HTML and RTF email messages is turned on. You can turn off this
feature using the BlackBerry Manager.
This document outlines the expected impact of supporting HTML and RTF email messages on the
BlackBerry Enterprise Server. This feature might cause the BlackBerry Enterprise Server to use
increased amounts of CPU resources.
Load test conditions
Load tests were run to determine the impact of supporting HTML and RTF email messages on
BlackBerry Enterprise Server version 4.1 SP6. The load tests were conducted under certain load
conditions; the results experienced in your organization’s environment might be different.
During the load tests, only HTML and RTF email messages were used. The messages were sent to
2000 BlackBerry device users.
Percent of
messages (%) Contents Size (KB)
69 HTML table and HTML signature 82
13 HTML table, HTML signature, and small GIF 380
12 HTML link with media content 307
6 HTML table, HTML signature, and large JPEG 3103
The message load was applied to an environment that used BlackBerry Enterprise Server version 4.1
SP6 with support for HTML and RTF email messages turned on. The same message load was
applied to an environment with BlackBerry Enterprise Server version 4.1 SP6 with support for HTML
and RTF email messages turned off, and the results were compared. The load tests were run for 4
hours. Measurements were taken for the last 2 hours of the load tests.
The impact on the BlackBerry Enterprise Server varies depending on the workload characteristics of
your organization’s environment and on the number of HTML and RTF email messages that users
are likely to send from and receive on their BlackBerry devices.
Production environments are expected to demonstrate a lower impact on the BlackBerry Enterprise
Server than the results discussed in this document, because the number of HTML and RTF email
messages are likely to be less than 100%, and the number of active BlackBerry devices that support
HTML and RTF email messages are likely to be less than 100%.
Results
When HTML and RTF email messages are sent and received, the BlackBerry Enterprise Server uses
up to 58% more CPU resources.
Conclusions
Monitor the CPU resources that the BlackBerry Enterprise Server uses. If the BlackBerry Enterprise
Server uses an unacceptable amount of CPU resources, you can use the BlackBerry Manager to turn

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off support for inline images in HTML and RTF email messages to reduce the amount of resource
consumption. If the BlackBerry Enterprise Server continues to use an unacceptable amount of CPU
resources, you can use the BlackBerry Manager to turn off support for HTML and RTF email
messages. If you turn off support for this feature, BlackBerry Enterprise Server version 4.1 SP6 uses
a similar amount of CPU resources as BlackBerry Enterprise Server version 4.1 SP5.

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Document ID: 19871650
Last Modified: July 2, 2008