I've created a cab file to set up most of the info needed for push activesync and it works fine on a jasjar and on a k-jam, but fails on an HP 6915 - it appears that the XML model in the 6915 is different.  The HP6915 claims to be running AKU2.3 (which is later than the the jasjar and k-jam, but I can't find any info on what has changed in wap-provisioningdoc.  As the HP device is with a user, I can't easily try lots of variations.

<wap-provisioningdoc>
  <characteristic type="Sync">
    <characteristic type="Connection">
      <parm name="Server" value="mail.mysite.com"/>
      <parm name="AllowSSLOption" value="1" />
      <parm name="Domain" value="mysite.com" />
    </characteristic>
    <characteristic type="Settings">
      <parm name="BodyTruncation" value="5120"/>
    </characteristic>
    <characteristic type="Mail">
       <parm name="Enabled" value="1"/>
       <parm name="MailBodyTruncation" value="5120"/>
       <parm name="MailFileAttachments" value="0"/>
       <parm name="EmailAgeFilter" value="4"/>
    </characteristic>
    <characteristic type="FolderHierarchy">
      <characteristic type="Sent Items">
        <parm name="SyncEnabled" value="1"/>
      </characteristic>
    </characteristic>
    <characteristic type="Calendar">
      <parm name="Enabled" value="1"/>
    </characteristic>
    <characteristic type="Contacts">
      <parm name="Enabled" value="1"/>
    </characteristic>
  </characteristic>
</wap-provisioningdoc>