Unknown error reading the calendar

When I create a new calendar in Exchange, it isn't shown in OWA/Outlook , and when I create an event or task in this calendar using Thunderbird, I can't view it in any place, because It doesn't appear in OWA/Outlook or in Thunderbird.

I'm using the Windows 7, and the log shows me the following error messages when it's trying to read the calendar:

unknown [object Object]: User:xunta\<email address hidden>

[calTimezoneService] using C:\Users\dsanher\AppData\Roaming\Thunderbird\Profiles
\brrjimmh.default\extensions\{e2fda1a4-762b-4020-b5ad-a41df1933103}\timezones.sq
lite
[calTimezoneService] timezones version: 1.2010i
27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: Init

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

[calAlarmService] starting...
27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: do init

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: getAccount

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: doRequest

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: USER: xunta\administrador.exc
<email address hidden>

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: autodiscover

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: setup req to https://autodisc
over.xunta.es/autodiscover/autodiscover.xml user xunta\administrador.exchange@xu
nta.es

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: Sending: <?xml version="1.0"
encoding="utf-8"?>
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/
requestschema/2006">
  <Request>
    <EMailAddress><email address hidden></EMailAddress>
    <AcceptableResponseSchema>http://schemas.microsoft.com/exchange/autodiscover
/outlook/responseschema/2006a</AcceptableResponseSchema>
  </Request>
</Autodiscover>

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: do init done

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: getInterface

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: IID: {d974c99e-4148-4df9-8d98
-de834a2f6462}

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: reply

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1:

27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: fail status: 0

Warning: Ha habido un error al leer datos del calendario: Calendario 1. Sin emba
rgo, este error parece menor, por lo que el programa intentará continuar. Código
 de error: 0x0. Descripción:
27cd52a2-e992-46b7-9040-bf53da6053ad/Calendario 1: Sending: <?xml version="1.0"
encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:t="h
ttp://schemas.microsoft.com/exchange/services/2006/types" xmlns:m="http://schema
s.microsoft.com/exchange/services/2006/messages">
  <soap:Header>
    <t:RequestServerVersion Version="Exchange2007_SP1"/>
  </soap:Header>
  <soap:Body>
    <m:FindItem Traversal="Shallow">
      <m:ItemShape>
        <t:BaseShape>IdOnly</t:BaseShape>
        <t:AdditionalProperties>
          <t:FieldURI FieldURI="calendar:UID"/>
          <t:FieldURI FieldURI="calendar:CalendarItemType"/>
        </t:AdditionalProperties>
      </m:ItemShape>
      <m:CalendarView StartDate="2010-12-26T11:34:00Z" EndDate="2011-02-06T11:34
:00Z"/>
      <m:ParentFolderIds>
        <t:DistinguishedFolderId Id="calendar"/>
      </m:ParentFolderIds>
    </m:FindItem>
  </soap:Body>
</soap:Envelope>

The error message that is shown is spanish is: "Warning: It has been an error reading data from calendar: Calendario 1. However, this error seens to be small, so the program will attemp to continue. Error code: 0x0. Description: ..."

Any ideas about how to fix it?? Thanks in advance, David.