ICal can't refresh - lost connection to Exchange

iCal 4.0.4
Snow Leopard 10.6.8
Exchange Server 2008
iCal had been working until yesterday but now will not connect to the server.
I have deleted the account and added it again...it adds a version of the calander that is a few days old but will not connect to add or change anything.
message is iCal can't refresh events in the calendar
The account *** currently can't be refreshed.
Mail is connected perfectly and iPhone is connected for Mail and Calander with no issues.
Any ideas? Thanks

I have now updated to OS X Lion and so iCal has updated... no change iCal has populated with a 3 day old version of the Exchange calander

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    <style type="text/css">P { margin-bottom: 0.21cm; }</style>
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    Error in testing RPC / HTTP.
    additional Details
    Elapsed time: 24295 ms.
    Test steps
    Connectivity Analyzer Microsoft is trying to test Autodiscover for [email protected] .
    Error in automatic detection test .
    additional Details
    Elapsed time: 24294 ms.
    Test steps
    Attempting each method of contacting the Autodiscover service .
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    additional Details
    Elapsed time: 24294 ms.
    Test steps
    Trying to prove possible Autodiscover URL https://empresa.com/AutoDiscover/AutoDiscover.xml
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    additional Details
    Elapsed time: 1509 ms.
    Test steps
    Attempting to resolve the host name in DNS empresa.com .
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    additional Details
    IP addresses returned : 80.36.252.194
    Elapsed time: 507 ms.
    Testing TCP port 443 on the host to ensure empresa.com listening or is open.
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    additional Details
    Elapsed time: 464 ms.
    Testing the SSL certificate to make sure it is valid.
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    additional Details
    Elapsed time: 537 ms.
    Test steps
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    Validating the certificate name .
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    Connectivity Analyzer Microsoft is trying to build certificate chains for certificate CN = ​​mail.empresa.com .
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    The certificate chain did not end in a trusted root . Root = CN = mail.empresa.com
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    Elapsed time: 21723 ms.
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    additional Details
    IP addresses returned : 46.16.56.40
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    Testing TCP port 443 on the host to ensure autodiscover.empresa.com listening or is open.
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    additional Details
    Network Error communicating with the remote host.
    Elapsed time: 21224 ms.
    Attempting to contact the Autodiscover service with the HTTP redirect method .
    Error when trying to contact the Autodiscover HTTP redirect method .
    additional Details
    Elapsed time: 606 ms.
    Test steps
    Attempting to resolve the host name in DNS autodiscover.empresa.com .
    The host name is resolved correctly .
    additional Details
    IP addresses returned : 46.16.56.40
    Elapsed time: 14 ms .
    Testing TCP port 80 on the host to ensure autodiscover.empresa.com listening or is open.
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    Elapsed time: 202 ms.
    Connectivity Analyzer Microsoft is checking the automatic detection of host empresa.com for an HTTP redirect to the Autodiscover service.
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    additional Details
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    lenny3 with Suhosin -Patch X -Powered -By : PHP/5.2.6-1 + lenny3 HTTP Response Headers : Connection : close Content- Length: 1209 Content- Type: text / html Date: Wed, 12 Mar 2014 15:27: 58 GMT Server : Apache/2.2.9 (Debian ) PHP/5.2.6-1 + lenny3 with
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    Attempting to contact the Autodiscover service using the method of DNS SRV redirect server.
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    additional Details
    Elapsed time: 186 ms.
    Test steps
    Trying to find the SRV record in DNS _autodiscover._tcp.empresa.com .
    Not the Autodiscover SRV record in DNS found .
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    additional Details
    Elapsed time: 186 ms.
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    additional Details
    No Autodiscover CNAME record for your domain ' empresa.com ' .
    Elapsed time: 268 ms.
    jspt

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    We have the Self-signed certificate that comes with Exchange, and we've created a new self-signed including all our domains mail.company.com, domain.local, exchange13.domain.local, autodiscover.company.com, autodiscover.domain.local.
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    RunspaceId                           : 89c86f8e-d156-4480-b31d-59215976879b
    Name                                 : EXCHANGE13
    Fqdn                                 : EXCHANGE13.domain.local
    ClientAccessArray                    :
    OutlookAnywhereEnabled               : True
    AutoDiscoverServiceCN                : EXCHANGE13
    AutoDiscoverServiceClassName         : ms-Exchange-AutoDiscover-Service
    AutoDiscoverServiceInternalUri       : https://autodiscover.company.com/Autodiscover/Autodiscover.xml
    AutoDiscoverServiceGuid              : 77378f46-2c66-4aa9-a6a6-3e7a48b19596
    AutoDiscoverSiteScope                : {Nombre-predeterminado-primer-sitio}
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    IsOutOfService                       : False
    WorkloadManagementPolicy             : DefaultWorkloadManagementPolicy_15.0.825.0
    Identity                             : EXCHANGE13
    IsValid                              : True
    ExchangeVersion                      : 0.1 (8.0.535.0)
    DistinguishedName                    : CN=EXCHANGE13,CN=Servers,CN=Exchange Administrative Group
                                           (FYDIBOHF23SPDLT),CN=Administrative
    Groups,CN=First Organization,CN=Microsoft
                                           Exchange,CN=Services,CN=Configuration,DC=domain,DC=local
    Guid                                 : e83055fe-217b-4ed6-9cd0-7711097baf99
    ObjectCategory                       : domain.local/Configuration/Schema/ms-Exch-Exchange-Server
    ObjectClass                          : {top, server, msExchExchangeServer}
    WhenChanged                          : 09/03/2014 12:46:07
    WhenCreated                          : 08/03/2014 19:15:54
    WhenChangedUTC                       : 09/03/2014 11:46:07
    WhenCreatedUTC                       : 08/03/2014 18:15:54
    OrganizationId                       :
    OriginatingServer                    : severdc.domain.local
    ObjectState                          : Unchanged
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    Thanks!!
    jspt

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