This bulletin summary lists security bulletins released for April 2007.

Security Central: Microsoft has provided information, about how you can help protect your computer system, at the following locations:
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Consumers can visit Security At Home, where this information is also available by clicking “Latest Security Updates”.
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IT Professionals can visit the TechNet Security Center.

Update Management Strategies: Security Guidance for Patch Management provides additional information about Microsoft’s best-practice recommendations for applying security updates.

IT Pro Security Zone Community: Learn to improve security and optimize your IT infrastructure, and participate with other IT Pros on security topics in IT Pro Security Community.

Microsoft Security Notification Service: To receive automatic e-mail notifications whenever Microsoft Security Bulletins are issued, subscribe to Microsoft Technical Security Notifications.
Summary

This bulletin summary includes security updates for newly discovered vulnerabilities. Their security bulletins, in order of severity, are as follows:

more info here-
http://www.microsoft.com/technet/sec...mspx?cid=31240