When I send a document from within a Microsoft Office application such as Microsoft Word, Outlook Express comes up. How can I set up my Default Mail Client to use OWA?

To set OWA as the default mail client, you need to use a third party add-on, such as ActiveSend from Messageware (www.messageware.com).  ActiveSend gives users the ability to set OWA as the default email within desktop applications, enabling the SendTo and MailTo functions, hyperlinks in web pages.