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[Solved] Office 365 : Unable to connect outlook to Office 365, after migration.

When Migrating to Office 365 you need to reconfigure your Outlook profile.

You need to change your internal and external Autodiscover DNS setting.

Most of the time, this doesn’t work for the internal users, because Outlook is hard-coded to query an AD Service Connection Point (SCP) to locate a server with the Autodiscover service

When this fails Outlook falls back to the next DNS based methods or uses a local XML file.

This XML file is located in the AutoDiscoverServiceInternalUri

Check the AutoDiscoverServiceInternalUri

Get-ClientAccessServer |select AutoDiscoverServiceInternalUri

Solution 1 Powershell

The easiest way to change this is using Powershell to change the AutoDiscoverServiceInternalUri to NULL:

Set-ClientAccessServer –Identity SERVERNAME -AutoDiscoverServiceInternalUri $null

Solution 2 Adsi Edit

If the above method can no longer be used you can use ADSIEdit to remove the SCP manually.

The full path of the SCP is:

CN=ServerName,CN=Autodiscover,CN=Protocols,CN=ServerName,CN=Servers,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=OrganizationName,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=DomainName,DC=Suffix

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Testing the installation

Use the to test the Autodiscover settings: