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We are using an Office365 Hyrbid deployment with Exchange 2016 on premise. The Hybrid setup was deployed after our users and groups were created and synced from AD, so they do not currently appear in our Exchange server.

Is there any way to make these groups Exchange aware, without having to delete and recreate them from scratch?

With our mailboxes in Exchange Online, we had to run a New-RemoteMailbox command for each mailbox, so wonder if there is some way to manually populate the required attributes in these groups so they show in Exchange.

I suspect not possible though.

EDIT: I should point out that when we synced the groups, we had already populated the ProxyAddresses attribute, so that they appeared with the correct domain in 365. What we want is for these groups to now be manageable from our on premise Exchange server.

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  • You want the AD groups to have email attributes for the on premise server or for Office365? – user5870571 Jun 10 '16 at 16:32
  • Sorry my question is a little unclear. The groups have enough of their normal AD attributes populated so they sync to 365 and work using our primary domain as expected. What I need, is for the normal msExch* attributes to be populated in a way they would be if I created the group through Exchange in the first place. – James Edmonds Jun 10 '16 at 16:48
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The solution to this was for me to convert our groups from Global to Universal types (Thanks to @user5870571 for turning me on to this initially), and then run a command in the Exchange management shell to mail enable the groups.

The command was:

Enable-DistributionGroup -Identity "Group Name" -PrimarySMTPAddress "address_for_group@domain.com"

So simple if you know what commandlet to use.

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Based on how you asked your question I believe the answer is that you need to use ADSIedit.

  1. Login to one of your DCs
  2. Run adsiedit.msc
  3. Open DC=DOMAIN,DC=TLD,OU=OU(USERS)
  4. Right click the group you want to edit
  5. Click Properties
  6. Click Attribute Editor
  7. Click proxyAddress
  8. Click Edit
  9. Enter the email address you want to use for the group (the email address should be in all uppercase letters unless the email address is going to be an alias).
  10. Click Add
  11. Click OK
  12. Click Apply
  13. Click OK
  14. Perform a manual DirSync with Office365

http://enterpriseit.co/office365/create-email-alias-dirsync/

https://www.puryear-it.com/add-email-alias-secondary-email-office-365-account-ad-dirsync

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  • I think my question was a little unclear, as the above is what we have already been doing for the past year so the groups work with our domain in 365. This however does not make them Exchange aware, as the process does not include any of the msExch* attributes that Exchange populate when it creates the group. My scenario is Exchange Online knows about the group, Exchange on-premise doesn't. – James Edmonds Jun 10 '16 at 16:50
  • Are you creating the groups in Exchange Online or in AD? – user5870571 Jun 10 '16 at 16:52
  • Groups are created in AD, then synced to 365. – James Edmonds Jun 10 '16 at 21:44
  • Why can't you create an email enabled group in AD (which by default should be on premise Exchange aware) and then add proxyAddress and do the dirsync so the group is seen in Office 365? – user5870571 Jun 10 '16 at 21:53
  • If I create an AD distribution group, it does not automatically show up in Exchange. Unless I need to set it to Universal rather than global? – James Edmonds Jun 10 '16 at 21:57

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