<rewrite>
<rules>
  <rule name="Redirect to www" stopProcessing="true">
      <match url="(.*)" />
      <conditions trackAllCaptures="false">
        <add input="{HTTP_HOST}" pattern="^domain.com$" />
      </conditions>
      <action type="Redirect" url="{MapProtocol:{HTTPS}}://www.domain.com/{R:1}" />
  </rule>
</rules>
</rewrite>