A new version of Time zone Data Update Tool was released and it has better support or Israel and Brazil.
This August 2008, Microsoft has released an update to the Outlook Time Zone Update Tool. This new version (Version 3.0) offers, amongst others, better support for Israel and Brazil with regards to time zone handling and rebasing of calendars.
The Exchange Calendar Update Configuration Tool utilizes the Time Zone Data Update Tool for Microsoft Office Outlook for rebasing operations, which is why version 2.0 of the Exchange Calendar Update Configuration Tool included the Time Zone Data Update Tool for Microsoft Office Outlook, in a redistributable format, as part of the package.
Read more at source: http://msexchangeteam.com/archive/2008/08/15/449583.aspx