I noticed following problem – Hyperlinks are not working in Outlook (Office 2013)
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This usually happens when there is no default Internet browser (properly) registered in Windows. It often happens after uninstalling the Google Chrome browser but there are also other instances for which this can happen.
More info can be found here – http://www.msoutlook.info/question/242
The solution is quite simple by MS Fix-it – http://support.microsoft.com/kb/310049/en-us