Create appearance with html body using webdav

I am creating Outlook appointments using webdav. I am using the following post to create an appointment.

<?xml version="1.0"?>
<g:propertyupdate xmlns:g="DAV:" 
    xmlns:e="http://schemas.microsoft.com/exchange/"
    xmlns:mapi="http://schemas.microsoft.com/mapi/"
    xmlns:mapit="http://schemas.microsoft.com/mapi/proptag/"
    xmlns:x="xml:"
    xmlns:cal="urn:schemas:calendar:"
    xmlns:dt="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/"
    xmlns:colors="http://schemas.microsoft.com/mapi/id/{00062002-0000-0000-C000-000000000046}/"
    xmlns:header="urn:schemas:mailheader:"
    xmlns:mail="urn:schemas:httpmail:"
>
<g:set>
<g:prop>
<g:contentclass>urn:content-classes:appointment</g:contentclass>
    <e:outlookmessageclass>IPM.Appointment</e:outlookmessageclass>
    <mail:subject>Test</mail:subject>
    <mail:htmldescription>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.01//EN&quot;&quot;http://www.w3.org/TR/html4/strict.dtd&quot;&gt;
            &lt;html&gt;&lt;body&gt;
            &lt;table&gt;
            &lt;tr&gt;&lt;td&gt;Telefonnummer:&lt;/td&gt;
                    &lt;td&gt;&lt;b&gt;123123423453245&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
            &lt;tr&gt;&lt;td&gt;Name&lt;/td&gt;
                    &lt;td style=&quot;color:red;&quot;&gt;Hille, Christian&lt;/td&gt;&lt;/tr&gt;
            &lt;/table&gt;
            &lt;/body&gt;
            &lt;/html&gt;
    </mail:htmldescription>
    <cal:location></cal:location>
    <cal:dtstart dt:dt="dateTime.tz">2009-10-05T14:37:17.000Z</cal:dtstart>
    <cal:dtend dt:dt="dateTime.tz">2009-10-05T14:52:17.000Z</cal:dtend>
    <cal:busystatus>BUSY</cal:busystatus>
    <cal:reminderoffset dt:dt="int">900</cal:reminderoffset>
    <colors:0x8214 dt:dt="int">10</colors:0x8214>
    </g:prop>
</g:set>
</g:propertyupdate>

      

        
        
        
      

    

Appointment assigned. But Outlook does not display text generated in html. Bold text is in bold. The table and style attribute are ignored.

Is Outlook html supported? How to display a table in the body of the target?