(Solved) Outlook connectivity issues (Outlook 2013/2016 on Windows 10 to Exchange)

Cristian Ruiz 191 Reputation points


I was in a middle of a migration from Exchange 2010 to 2019 (passing between to 2016 first), and we are doing a laboratory stage. We are having issues trying to connect Outlook 2013/2016 to Exchange 2010, only if it is running on Windows 10, because we have tested it on Windows 7 and runs without any issue.

The issue is that when I want to configure for first time the Outlook profile for a test user, the configuration wizard reports the error "Exchange Server connection is not available. Outlook has to be online..." or something like that. And I repeat, same Outlook version on Windows 7 configures, opens and can be use it, without any issue.

Does anybody know what is going on? I have tested it with Outlook 2013 and 2016.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,388 questions
{count} votes

1 answer

Sort by: Most helpful
  1. Kael Yao-MSFT 37,576 Reputation points Microsoft Vendor

    Hi anonymous user

    Thanks for the update and glad to hear the issue has been resolved!
    I've also seen this issue before: Outlook and default gateway
    Glad you figured it out.

    Due to a recent update in forum policy, the question author is not able to accept their own answers.

    I have written a brief summary of this issue.
    Please feel free to accept it as the answer to the question to help other community members.
    Thanks again for the sharing!

    Issue Symptom:
    Unable to connect Outlook to Exchange mailboxes when the default gateway on the device is invaild


    1. configure a valid default gateway on the affected device
    2. add a DWORD value named DefConnectOpts to registry: HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\RPC and set its value to 0
    0 comments No comments