Migrating from Office 365 to Outlook 2010 – Outlook Profiles Cutover

Not many people are migrating OUT of Office 365. In fact it is just the opposite, everyone is migrating INTO Office 365.

I have had the pleasure of working on an interesting project recently. I have been working with a company that has an on-premise Exchange 2010 environment who recently acquired a company that has user mailboxes completely in Office 365. Their end goal: Move everyone out of Office 365 and into an on-premise Exchange 2010 environment.

One of the major drawbacks associated with performing a cut-over migration from both on-premise into the cloud, and from the cloud back to on-premise is the end user outlook profile.

Each Outlook profile at some point will need to be recreated to connect to Office 365 or your on-premise environment.

If this is to be done manually on every migrated user in the company, you could imagine that this could be a very time consuming process, as you would have to:

1. Create a new profile
2. Set it as the default
3. Configure it for the user

I found a way to automate this process using Group Policy to run a script to create a new, blank Outlook profile and set it as the default profile. The end user will be presented with the first time profile setup screen when opening Outlook and should be able to use Autodiscover to automatically find their new Outlook 2010 on-premise profile settings:

I created a PowerShell script  to do the dirty work:


This script will create a new profile called “Outlook2010” and set it as the default profile.

Outlook 2010 Registry Settings

Outlook 2013 Registry Setting

A new Group Policy Object will need to be created via Group Policy Preferences to run the PowerShell script.Leaving the GPO in place is safe to do for a few days as it will not overwrite or remove existing profiles. This will allow for people who are to be migrated over time to or are out of office during migrations to see these results.

This is beneficial because if you are like me, you don’t migrate all of your users in a “Big Bang” fashion.

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