Computerworld reports that Microsoft has declined to patch a vulnerability in Office XP

Office XP, which debuted in March 2001, remains on Microsoft's list of supported suites -- users will continue to receive security updates through mid-July 2011. But on Tuesday, Microsoft said a COM (component object model) validation vulnerability in the aged suite couldn't be patched.

The decision was explained in one of the 10 updates Microsoft issued yesterday that patched a record-tying 34 vulnerabilities.

  Microsoft leaves some Office XP users patchless