HTTP to HTTPS Redirect - IIS 8.5 not working properly

I've read a number of posts here on SO as well as on the 'net (IIS blogs, etc.). I'm trying to force all connections going from domain.com to www.domain.com and at the same time forcing the request from HTTP to HTTPS.

I'm using this set of rules and rewrites but the only thing happening is that it's redirecting fine but not redirecting to SSL.

<!-- Redirect to HTTPS -->
<rewrite>
    <rules>
        <rule name="Redirect to www" stopProcessing="true">
            <match url="(.*)" />
            <conditions trackAllCaptures="false">
                <add input="{HTTP_HOST}" matchType="Pattern" pattern="^mydomain.com$" ignoreCase="true" negate="false" />
            </conditions>
            <action type="Redirect" url="{MapProtocol:{HTTPS}}://www.mydomain.com/{R:1}" />
        </rule>
    </rules>
    <rewriteMaps>
        <rewriteMap name="MapProtocol" defaultValue="http">
          <add key="on" value="https" />
          <add key="off" value="http" />
        </rewriteMap>
    </rewriteMaps>
</rewrite>

What am I doing wrong?

Main blog reference: http://weblogs.asp.net/owscott/url-rewrite-protocol-http-https-in-the-action and this SO post - web.config redirect non-www to www

Edit: So I found this blog post: http://www.meltedbutter.net/wp/?p=231 and gave it a try and voila! Worked like a charm. Not sure why this worked over the rules posted above but in my case the below is working and successfully taking all non-www traffic and redirecting it to both www and https.

<!-- Redirect to HTTPS -->
        <rewrite>
            <rules>
                <rule name="http to https" stopProcessing="true">
                    <match url="(.*)" />
                    <conditions>
                        <add input="{HTTPS}" pattern="^OFF$" />
                    </conditions>
                    <action type="Redirect" url="https://www.domain.com/{R:1}" redirectType="SeeOther" />
                </rule>
            </rules>
        </rewrite>