I purchased a new computer with Windows 7. My old computer was running XP. I copied over the pst files and everything seems to be fine with one exception. When I click to create a new message, and then click the "to" button, none of my address books show up. According to help, I need to right click the contacts folder, click properties, the address book tab, and then check the box that says show this folder as an email address book. The problem is that the box is grayed and will not let me check it.