Zimbra calendar SOAP interface

[ict4schools]

I'm using the Zimbra SOAP API to get todays appointments. I do also want the instance details so I could use those to detect unique items.

I have, in the day on which i'm searching 5 appointments, but when I search I get only 1 appointment, not 5. Some recurring items are left out. But on some occasions (other dates for example), they are not left out. So I don't understand the behavior of the SearchRequest on the appointments.

This is my SOAP Request:

<SOAP-ENV:Body>
    <SearchRequest xmlns="urn:zimbraMail" types="appointment" limit="500" fetch="all" calExpandInstStart="1258585200000" calExpandInstEnd="1258671599000">
      <query>appt-start:11/19/2009  sort:dateasc</query>
    </SearchRequest>
  </SOAP-ENV:Body>

I do saw this note in the documentation:

***IMPORTANT NOTE: Calendar Items that have no instances within
   that range are COMPLETELY EXCLUDED from the results (e.g. not even
   an <appt> element>.  Calendar Items with no data (such as Tasks
   with no date specified) are included, but with no instance
   information***

But because there are appointments on that day, I guess that they should not be excluded.

I see other people using GetApptSummariesRequest, but since the documentation says it's deprecated, I wanted to use SearchRequest, as it's mentioned. However I find it does not find all appointments.

Sorry for the lack of explaination, but at the moment I cannot do any better.

[ict4schools]

For the sake of debugging I have tried to use GetApptSummaryRequest, using the following request:

<SOAP-ENV:Body>
    <GetApptSummariesRequest xmlns="urn:zimbraMail" s="1258585200000" e="1258671599000"/>
  </SOAP-ENV:Body>

It gets me all the items (5 of them). But appart from the appointment, which was showed by the SearchRequest, the other items are empty. So I guess they do really don't have an instance between that start and end date.

How do I get all the appointments between begindate/time and enddate/time? With all items, even recurring?