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Exchange Hybrid - Remote Mailbox connectivity problem.

Checior200 0 Reputation points
2025-01-02T11:44:50.1866667+00:00

Hello, I am facing aproblem with a mailbox/profile connectivity in outlook desktop in hybrid environment.
The case:

  1. We created user, enabled remotemailbox, then mailbox after delta is provisioned in the cloud.
  2. User go for holidays, we convert remoteusermailobx and cloud mailbox into sharedmailbox, also remove license
  3. I believe that in this time user account was unsynced for over 30days because we moved it to unsynced OU.
  4. When user come back to work, we synced again user account, enabled remotemailbox, got exchange guid from cloud and paste it into on-prem attribute.
  5. User can use OWA Outlook but cannot connect Outlook 2016/365 with Exchange. Anyone faced with similar problem and can help me with it?

Now, we have user with enabled remote shared mailbox, no license assigned and no cloud mailbox.

I tried to disable-remotemailbox, then re-create it. After this user can use OWA but cannot connect with Outlook... And i think this is main problem, OWA works, outlook on-prem does not.

I read whole google, sadly there is no answer or i cannot ask good question.

Thank you in advance.

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Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. Anthony LAVABRE 1,225 Reputation points
    2025-01-02T15:33:14.4933333+00:00
  2. Bruce Jing-MSFT 7,630 Reputation points Microsoft Vendor
    2025-01-03T07:08:12.6266667+00:00

    Hi,@Checior200

    Thanks for posting your question in the Microsoft Q&A forum.

    Based on the information you provided, if OWA is working fine , only Outlook is having problems. It can be inferred that there is a problem with the Outlook configuration.

    1.First you have to clear the old Outlook profile. You need to go to Control Panel > (search for) mail and find the “Mail ” option.

    User's image

    2.Go follow the link under Profiles > Show Profiles

    User's image

    3.Here you want to select your existing profile and Remove it, then Add a new one.

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