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Outlook takes long time to connect to Exchange 2019

Exchange_Newbie 121 Reputation points
2021-03-24T13:25:40.36+00:00

Hi All,

I have an existing exchange 2013 and in the process to migrate to Exchange 2019. I have installed the Exchange 2019 and while performing the outlook client testing for a test mailbox in Exchange 2019, I found that outlook is taking too long to connect to the Exchange 2019. Tried in both outlook 2016 & 2019 with latest patches.

Any ideas?

Exchange | Exchange Server | Management
Exchange | Exchange Server | Management
The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
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  1. Ashok M 6,876 Reputation points
    2021-03-24T13:32:13.74+00:00

    Hi @Exchange_Newbie ,

    Looks like issue with the autodiscover queries to the office365 possibly. Try adding ExcludeExplicitO365Endpoint registry key and see if that helps.

    • Open regedit
    • Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\x\Outlook\AutoDiscover
    • Add a new DWORD entry
    • Enter the name of ExcludeExplicitO365Endpoint and value of 1.

    Please note: Export/backup of registry before making changes.

    If not, kindly share the exact version of the outlook and also does it happen every time or first time while configuring profile? Any add-ins?

    https://learn.microsoft.com/en-us/answers/questions/198505/unable-to-create-new-outlook-profile-after-deployi.html
    https://learn.microsoft.com/en-us/outlook/troubleshoot/profiles-and-accounts/unexpected-autodiscover-behavior

    If the above suggestion helps, please click on "Accept answer" and upvote it. Thanks for understanding.

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