For customers running a BlackBerry Enterprise Server, Daylight Savings settings are pushed down to the device via the server.
Information on how to ensure the BlackBerry and Microsoft Exchange environments are correctly patched are located here:
http://www.blackberry.com/btsc/kb18251
and here
http://www.blackberry.com/btsc/kb18250
For customers using BIS only (not connected to a BES) running BlackBerry Device Software Version 4.2.1 or later, the device already has the required Daylight Saving Time (DST) table so no action is required.
For customers running firmware older than 4.2.1, they must download the patch to the device. This patch can be downloaded from the device browser from here:
http://www.blackberry.com/dst2007/patches/carrier/4.2/net_rim_bb_timezoneupdater.jad
NOTE: To locate BlackBerry Device Software version information, on the BlackBerry device, in the device Options menu, click About.
To update the firmware on your BlackBerry to the latest version find your carrier software download site here: http://na.blackberry.com/eng/support/downloads/download_sites.jsp
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