Glen (gsexdev.blogspot.com) demonstrated in his last blog entry how to create an OWA customized form to use Maps and StreetView, there are also pictures in his blog demonstrating the form.
For those brave souls who attended my MVP theatre talk on Friday here's the OWA customization I demo'ed. The basics of creating custom forms are documented in the Exchange SDK . But putting this together can be a little tricky so let's go though some of the basis's step by step.
Firstly I wanted to create a custom form that would display a map of the contacts address information and also a Street-view of the same address information using Google's new Streetview features that was recently released for Australia. For this I created some contact items with a Message class of IPM.Contact.Map.
Read more at source: http://gsexdev.blogspot.com/2008/09/owa-customization-example-using-maps.html