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This is one method of getting hyperlinks to work again when they are clicked in Outlook

This method involves editing the registry of Windows so utmost care should be taken. If you are unsure at all give us a call and we will be happy to come and fix you problem for you. 

If you received this error after uninstalling any application that takes over the HTML open command (including, but not limited to, Chrome & Firefox browsers) this is how to change the HTM/HTML association in the registry.

1. Start, click Run, type Regedit in the Open box, and then click OK.
2. Browse to HKEY_CURRENT_USER\Software\Classes\.html
3. Right click the value for the .html key and select Modify…
4. Change the value from “ChromeHTML” to “htmlfile” (or from FireFoxHTML to htmlfile)
5. Repeat for .htm, shtml, .xht, .xhtml, .xhtm keys

Repeat these steps for htm and .shtml keys if they exist. You may also want to check the xhtml and xhtm keys.

You need to restart Windows for the change to take effect.