I bought the new system and I installed windows vista on the system of the mines. I have also installed Outlook Express on a system. Since last one week I have problem in the perspective of mine. . Today I am trying to have the support of my PST files in Outlook contacts, but during this time that I have the error: "Ox 80070021 which says that the files are being blocked by another program." Now I do not know what to do can someone please resolve this problem and I can solve the problem of mines. These contacts are taken from the I-Phone.