I have Outlook 2007 and Windows 7. Recently, when there is a link in an e-mail and I attempt to use the link, I receive the error message "Unknown File Extension." I'm getting the error for all extensions - .com, .pdf, . . .Any help would be appreciated.

Hi, Regarding this issue, since it is related to Microsoft Office Outlook 2007 and we have specified support for this, it is recommended that you contact our Office Support for help: Microsoft Office Help and How-to Office Discussion Group Thanks. Hope the issue will be resolved soon!Nicholas Li - MSFT