Archive for 'Hybrid Deployment'

How to Map OnPrem Active Directory users to existing Office365 Users


In some cases it could happen that customers create accounts on Office365 and activate only in a second phase the synchronization with Active Directory.

The problem of this approach is that in some cases the O365 users will not be associated with the corresponding AD Accounts and the user must manage the accounts twice (separate passwords, etc.)

Dirsync will perform a “Soft Match” of the user ( ) but in some cases this will not work, for example if your cloud ...

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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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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 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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