The Outlook security configuration to Disable Internet Calendard Integration
it a nice concept but goes too far. Rather than just blocking or
unregistering the Webcal protocol, this setting also blocks any importing of
ICS/VCS files. This makes Outlook seem silly by allowing you to Export an
event but can't Import an event. If Internet Calendars are really a threat
then please consider a countermeasure that blocks automatic updates via
webcal but still allows events to be imported manually. Thanks.

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http://www.microsoft.com/office/comm....calendari ng