I tried to implemented the Default redirect rule but the default.aspx (in the root folder of my site) page seem to postback onto itself when i click on an asp button or link button. I don't have a problem with a standard href link which successfully allows me to navigate to a new page. This is what...

Are you redirecting your documents to extensionless? I'm asking because you have '^about' instead of 'about.aspx', you could try using the following for your 'Rewrite home page' rule. <match url="/default" ignoreCase="true" /> or <match url="...