We help IT Professionals succeed at work.

Prevent Team from showing in Outlook Global Address List

cmdolcet asked
Last Modified: 2019-04-17
How can I prevent Teams from creating a duplicate Engineering GAL address? The second Engineering list is an actual distribution group.
How can I avoid both from showing up in the the GAL list.Email GAL List
Watch Question

Systems Administrator
This one is on us!
(Get your first solution completely free - no credit card required)



If I use O365 with my active Directory. How would I control or change it in there
Steven AtencioSystems Administrator

Unfortunately I'm not very familiar with O365. From a bit of research I've been able to find the below information, I've never used this before so I can't verify for certain it works.


In short these pages say:
You can use following PowerShell cmdlet to hide an Office 365 Group from GAL:
Set-UnifiedGroup -Identity *** Email address(engineering@urdomain.com) *** -HiddenFromAddressListsEnabled $true

I hope that helps!



It does not recognize the "Set-UnifiedGroup command? Any ideas? Do I need to update my Powershell?
Steven AtencioSystems Administrator

Are you connecting to the exchange server through powershell?

I imagine you will need to do that first, if you hadn't already, then you'll run the command.


Thanks Steven,

Is there anything more GUI of a method, possible inside either the O365 or inside the active directory?
Steven AtencioSystems Administrator

I haven't tried this method but it may be worth trying:

  1. Open Active Directory Users and Computers console
  2. Click View Menu and select Advanced Features (to show the Attribute Editor tab)
  3. Find your Distribution List or Security Group (mail enabled) in the OU
  4. DO NOT search your group. Because if you open the DL/Group properties from search windows, it will NOT show the Attribute Editor which is the advanced feature)
  5. Double click to open the DL/Group to see the properties, then go to Attribute Editor tab.
  6. Find hideDLMembership attribute, double click to open and select True. Click OK twice to close the dialog boxes.

Again I've never done it this way, I've generally done it through exchange itself but it may be worth trying and seeing if it works how you're hoping.

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.