These enhancements include:
- Windows Firewall
- Data Execution Protection (for hardware that supports it)
- Pop-up blocker and security zone improvements for Internet Explorer that enhance default security
- Security Center that ties into built-in and third-party security applications
- And more
If you're in a networked environment, there are over 600 new Active Directory Group Policy Objects affecting security which is nice for centralized administration. So, having said all this, I'd definitely recommend applying SP2 if security is on your radar.
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