OWA URL simplification with URL Rewrite

gistfile1.xml

<rewrite>
  <rewriteMaps>
    <rewriteMap name="Exchange Server" />
  </rewriteMaps>
  <rules>
    <clear />
    <rule name="Redirect root (Exchange Server)" enabled="true" stopProcessing="true">
    <match url="^$" />
    <conditions logicalGrouping="MatchAny" trackAllCaptures="false" />
    <action type="Redirect" url="/owa" appendQueryString="false" />
  </rule>
    <rule name="Exempt OAB vdir from SSL (Exchange Server)" enabled="true" patternSyntax="Wildcard" stopProcessing="true">
    <match url="oab/*" />
    <conditions logicalGrouping="MatchAll" trackAllCaptures="false" />
    <action type="None" />
  </rule>
    <rule name="Exempt PowerShell vdir from SSL (Exchange Server)" patternSyntax="Wildcard" stopProcessing="true">
    <match url="powershell" />
    <conditions logicalGrouping="MatchAll" trackAllCaptures="false" />
    <action type="None" />
  </rule>
  <rule name="Force HTTPS (Exchange Server)" enabled="true" stopProcessing="true">
    <match url="(.*)" />
    <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
    <add input="{HTTPS}" pattern="Off" />
    </conditions>
    <action type="Redirect" url="https://{HTTP_HOST}/{R:1}" />
    </rule>
  </rules>
</rewrite>