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ChauLe-8759 avatar image
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ChauLe-8759 asked YukiSun-MSFT commented

migrated mailbox still show old mailbox name in Outlook profile

This issue is for an on prem to on prem cross forest exchange mailbox migration... also getting new primary email address.

We migrate AD account then migrate mailbox and workstation together.

When we log into the into the Outlook after the workstation has been migrated, everything connects nicely. Outlook is updated and all mail and folder are there. The only thing different is that the mailbox name is showing the legacy email address.

If we create a NEW outlook profile then the mailbox name shows as expected in Outlook.

How can we update mailbox display name without creating a new profile?

I have tried this to update this - HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Profiles.....
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But this only updates the display name in the account properties... not the mailbox display name

I want to update this
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Any suggestions? something is cached in the profile somewhere


office-exchange-server-administrationoffice-outlook-itpro
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Hi @ChauLe-8759 ,

Welcome to our forum!

Looks like your issue is more related to cross-forest mailbox moves, please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client. In order to better solve your problem, we will add "office-exchange-server-administration".

Thanks for your understanding and hope your question will be resolved soon!

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YukiSun-MSFT avatar image
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YukiSun-MSFT answered YukiSun-MSFT commented

Hi @ChauLe-8759,

Based on my research and test, the mailbox name showed up in the navigation pane as displayed in your screenshot is referenced from the profile registry below:

(Important: Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.)

 HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Profiles\(profile-name)\[big number]
 001f3001

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But as the [big number] is a long series of random letters and numbers, and there are many profile registry keys that have the entry "001f3001", it's kind of tricky to locate the one we want to modify. Actually during my test, I have to click and go through every key with the entry "001f3001" in order to find the one I need to change. Furthermore, the value of the registry entry contains binary data, which makes it quite complicated to modify and update.

So from my point of view, instead of trying to update the exsiting old profile, force the users to recreate a new Outlook profile could be a reletively simpler method. And we can take advantage of the group policy to bulk create outlook profiles for all users in the orgnization, see the article below:
How to create a new Outlook profile for all users in the domain
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.


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@YukiSun-MSFT Wow great find!

Well you know the reason why I don't want to create a new profile, that means all the user customizations in Outlook is gone. They have to redo it all..signature.. map PST .. fonts... HTML email...etc ... if we have 1000's of user re-creating new profile for each can be a pain.

But it looks like we may not have a choice as you have found where to modify the mailbox name...but it appears to be too difficult to script or automate this....

I still want to confirm what you are showing in the screen shot... I want to make the change, even if its binary... find some sort of binary converter? update that and confirm it changes the mailbox name

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@YukiSun-MSFT Update...I tried it and it works!!

In my case the domain name is easy to change ... the old email is user@company.com.au and new email is user@company.com (without AU).

I just open the binary value and just delete the AU

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I open Outlook and the name shows up without the .AU !

So the answer is YES it can be done, now can this be automated? =)

The challenge to automate is..

  1. Identify the sub key registry with the correct "001f3001" value (there are multiple of these)

  2. Some how delete the .AU

=(



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Hi @ChauLe-8759,

Fully understand that it could be a pain to recreate new profiles for all users. As regards to editing the registry value, great to see that you've sorted it out by yourself. During my test, I also just modified the letters part of the value. Found this thread which discuss a similar query and according to the suggestion provided by Diane, rather than deleting the account name and reentering it, we can replace the letters.

But when it comes to make it automated, totally agree with you on that it seems quite challenging to idetify the subkey and then edit the value. Sharing the steps with end users is not realistic either as serious problems might occur if they modify the registry incorrectly.


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AndyDavid avatar image
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AndyDavid answered ChauLe-8759 commented

I don’t think you can . As far as I know you have to create a new outlook profile to pick up the updated name

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Yes a new profile will definitely pick it up. I've been searching in the registry and still cannot find it. It must be referenced somewhere in the cache or ost?

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