As described in the subject, even though I can see it in the client, no tasks can be found through web service. Following is the request and response.

[Request]
HTML Code:
<?xml version="1.0" encoding="utf-8"?>
<getItemsRequest xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <view xmlns="http://schemas.novell.com/2005/01/GroupWise/methods">default recipientStatus message peek</view>
  <filter xmlns="http://schemas.novell.com/2005/01/GroupWise/methods">
    <element xsi:type="FilterGroup" xmlns="http://schemas.novell.com/2005/01/GroupWise/types">
      <op>and</op>
      <element xsi:type="FilterEntry">
        <op>eq</op>
        <field>subject</field>
        <value>Ф</value>
      </element>
      <element xsi:type="FilterEntry">
        <op>isOf</op>
        <field>@type</field>
        <value>Task task</value>
      </element>
    </element>
  </filter>
  <count xmlns="http://schemas.novell.com/2005/01/GroupWise/methods">-1</count>
</getItemsRequest>
[Response]
HTML Code:
<?xml version="1.0" encoding="utf-8"?>
<getItemsResponse xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <items xmlns="http://schemas.novell.com/2005/01/GroupWise/methods" />
  <status xmlns="http://schemas.novell.com/2005/01/GroupWise/methods">
    <code xmlns="http://schemas.novell.com/2005/01/GroupWise/types">0</code>
  </status>
</getItemsResponse>