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Many of the fixes in Outlook 2003 SP3 were
previously released in updates or hotfixes. New features
are all security-related and most can be disabled by
editing a registry key, if necessary for your business.
Office 2003 SP3 combines previously released fixes into
one update so you only need to install one service pack
if you have to reinstall Office 2003, not each service
pack in succession.
Included in the security fixes are the following items:
Office 2003 can no longer open or save certain file
formats. This is not an Outlook issue, as the file types
are not blocked in email messages; however I’m
mentioning it because it has the potential to affect
many sites since Office 2003 applications are blocked
from opening files created in older file formats. See KB
article 938810 for more information.
http://support.microsoft.com/kb/938810/
Outlook 2003 SP3 (and Outlook 2007) limits some of the
ways that custom properties can be introduced into
Outlook data stores. By default, Outlook no longer
enables Internet mail to create new custom properties.
Only properties that are already created in the default
mail delivery store are preserved for incoming e-mail
messages. This means opening a template (.oft) from the
file system may fail with the error "The custom form
could not be opened. An Outlook form will be used
instead". This can be disabled with a registry key. See
KB article 907985 for the key needed to disable this
feature.
http://support.microsoft.com/kb/907985
MAPI forms do not run in public folders and user folders
because by default, SP3 blocks MAPI forms that cause new
executables to be downloaded and started. KB article
938816 has more information on this security feature and
instructions on how to disable it if your site is
affected.
http://support.microsoft.com/?kbid=938816
Office 2003 can be configured to allow or deny specific
COM components. This feature lets administrators and
users set registry keys in order to enable or to disable
the instantiation point of a specific COM category in an
Office application. See KB 938815 for instructions.
http://support.microsoft.com/?kbid=938815
The behavior of add-ins, ActiveX controls, and COM
add-ins was changed in some scenarios in Office 2003 SP3
to improve the security poorly written COM components.
This can be disabled in the registry but the
recommendation is for the developer of the add-in or
control update their application. See KB 938814 for more
information.
http://support.microsoft.com/?kbid=938814
Attachments with the .gadget extension can no longer be
opened in Outlook. See KB 938811 for more information.
Ken Slovak has updated his
Attachment Options
application to allow users to manage this and other
blocked extensions.
http://support.microsoft.com/?kbid=938811
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