Pueden encontrar la descarga en: http://www.microsoft.com/downloads/details.aspx?FamilyID=8b492ed2-ea92-412f-a852-3aa1c58d9499&DisplayLang=en

Y la info técnica en: http://support.microsoft.com/?kbid=952580

Saludos,
Pablo D. Vernocchi
Microsoft Exchange MVP
MCSE + M / MCSE + Sec
https://mvp.support.microsoft.com/profile/Pablo