Microsoft Outlook is prone to an information-disclosure vulnerability. Attackers may be able to exploit this issue to gain access to potentially sensitive information that may aid in further attacks.
Block external access at the network boundary, unless external parties require service.
If global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.
Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This may indicate exploit attempts or activity that results from successful exploits.
Do not accept communications that originate from unknown or untrusted sources.
Do not scan and email documents to unsuspecting users.
Updates are available. Please see the references or vendor advisory for more information.