Hyperlink in TextBox

[KWC]

Using Office 2003, when you have a textbox set to IsHyperlink to true and
enter the following in the field for example

outlook://Inbox

It will open up Outlook and navigate to your Inbox.

However in Office 2007, it tries to open up this hyperlink in Internet
Explorer. Has support for this been discontinued, or is there another way to
link directly to Outlook folders?

Thanks
KWC