Posts Tagged 'Exchange'

Exchange Hybrid – Free/Busy not working between OnPrem and Office365


More than one of our customer opened tickets reporting that Free/Busy lookup between Cloud users and OnPrem Users has stopped working.
After checking the standard settings like autodiscovery, ews services, etc. is seems that this issue was related to the delegation trust and the token validation, maybe due some Microsoft “operations” or issues on their federation services.

In order to test this:

[PS] C:\Windows\system32>Test-FederationTrust -UserIdentity


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Integrate Lync OnPremise with Hosted Exchange – Part 1: IM and Presence

In the post I will describe the procedure to integrate Office365 Hosted Exchange with Lync installed OnPremise.

The reason to perform such configuration is that some Lync features (i.e. Enterprise Voice) are not available with Lync OnLine.

The final objective is to have Lync IM integrated in the Exchange OWA and use the Unified Messaging features.

As guideline look at:

Prerequisites for this configuration are:

  • Correctly configured Lync Infrastructure with Edge server published on Internet
  • Active Directory Federation
  • Exchange OnLine and some active accounts

In our ...

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Office 365 Hybrid: ERROR:Updating hybrid configuration failed with error Subtask ValidateConfiguration execution failed: Configure Legacy Exchange Support

Sometimes executing the Exchange 2010 SP2 Hybrid Configuration Wizard you may encounter the error:

ERROR:Updating hybrid configuration failed with error ‘Subtask ValidateConfiguration execution failed: Configure Legacy Exchange Support at Microsoft.Exchange.Management.Hybrid.Engine.ExecuteTask(TaskBase taskBase, TaskContext taskContext)

There error message is quite “generic” and find out where the problem can be is not so easy.

Sometimes it’s related to an EMC bug  resolved with the Exchange 2010 SP2 rollup 3, but in other cases the problem is related to a public folder issue or ...

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Exchange 365 Hybrid deployment Directory Based Edge Blocking

After deploying successfully the Exchange OnLine in Hybrid mode, where part of our mailbox are on Office 365 and the others on-premise, we have to define the best way to route our inbound mail traffic.

The mail flow can be configured setting the MX records for our domain pointing to:

  1. Office365 (Forefront Online Protection for Exchange): Microsoft will receive all mails and forward to our on-premise installation only the messages for the on-premise users. This means lower traffic on our on-premise exchange ...
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Exchange 2010 SP2 – hybrid Coexistence wizard – Federation Trust creation fails

I was unable to complete the HCW (Hybrid Coexistence Wizard) on our Exchange 2010 SP2  in order to configure a Hybrid Exchange 2010 Deployment.

Federation Services, TXT records on DNS and so on seems to be correct.

The Command (built by the Coexistence Wizard):

Set-FederatedOrganizationIdentifier -DelegationFederationTrust ‘Microsoft Federation Gateway’ -AccountNamespace ‘’ -OrganizationContact ” -Enabled $true

returns this error message:


An error occurred while attempting to provision Exchange to the Partner STS. Detailed Information “An unexpected result was ...

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Integrazione IM di Lync con OWA di Exchange 2010 SP1

Obiettivo: Attivare IM da OWA.

Per attivare l’integrazione è necessario installare i WebServices per OCS sul Server CAS di Exchange.

In particolare:

Se il primo componente non si lascia installare (richiede .NET 3.5 che ovviamente è ...

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