Drag and drop the application file into the Shortcuts Navigation of Outlook.
See http://www.msoutlook.info/question/89

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Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
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"Song" wrote in message
...
I'm using Outlook 2007. How to add a button inside Outlook to start
other application (excute shortcut on desktop)?