I use Vista. I attempted to open Outlook 2007 and got the following message" Cannot open your default e-mail folders. Outlook cannot start because a data file to send and receive mail cannot be found. To add a data file, such as a personal folder file, double-click the Mail icon in Windows Control Panel." I follow the instructions, select add to add a folder, it asks for the type of storage I want (MMService, Office Outlook Personal Folders File (.pst), Outlook 97-2002 Personal Folders File (.pst)). I choose the Office Outlook Personal Folders File option. It then takes me to the exact location where I should save it. However, when I select OK, I get the following message " This information service is not installed on your computer." At this point I don't know what to do to get my Outlook 2007 to function again.