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Pre Microsoft office 2003 SP3, when creating a new MAPI email account in outlook 2003 the default setting was to “Use Cached Exchange Mode”. I have noticed that after installing SP3 the default seems to now be disabled when creating an email account.

The following registry key allows you to enable it again and can obviously be scripted to run for users at logon:

HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\(profilename)\13dbb0c8aa05101a9bb000aa002fc45a

Change the data stored within the 00036601 (REG_BINARY) value. These are the usable items of data that can be stored within the key value:

84 01 00 00 = cached mode enabled for email (the default setting pre SP3)
84 05 00 00 = cached mode enabled for email, and public folders
04 00 00 00 = cached mode disabled (default setting post SP3)