Yesterday 11/14 at the same time as a security update was installed, Outlook 2007 calandar disappeared. I went back to an earlier date with no help. I tried to reinstall Office 2007 with no help. I tried Office repair several times with no help. I did an upgrade from Vista to Windows 7 Home Premium. When I try to open Calendar I get the following message. Cannot display the folder. Microsoft cannot access the specified folder location. The messaging interface has returned an unknown error. If the problem persists, restart Outlook. Outlook cannot open this item. The item may be damaged. I also get the following message: outlook:00000000BCC052DiE06A234A9CA612
. Underneith it is attached to a YouTube video link.