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So Am I.
The same problem. Unable to work with Outlook with this.
outlook on windows 11 does not connect to the internal exchange error 80000000
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Ion Lascu
1
Reputation point
Hello,
I recently(1 week) switched some of the workstations to windows 11.
But with the transition to Windows 11 I noticed that Outlook Office 365 or Outlook 2016 that I used to connect to the internal exchange server (Exchange server 2010, Windows Server 2008) through Outlook Anywhere no longer works.
The error received is: there is a problem with the proxy server's security certificate. Outlook is unable to connect to the proxy server autodiscover. Error Code 80000000
I mention that the security certificate is a purchased one and that it is functional.
On Windows 10 and Office Outlook 365 or Outlook 2016 works without problems for many years.
I have 3 days of intense internet searches but without success. Everything I tried doesn't work
Please advise me, I don't want to go back to Windows 10 although I reinstalled some more important workstations with Windows 10.
Outlook | Windows | Classic Outlook for Windows | For business
Exchange | Exchange Server | Management
7,925 questions
{count} votes
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ChristyZhang-MSFT 26,126 Reputation points Microsoft External Staff2021-10-25T02:39:42.6+00:00 Hi @Ion Lascu ,
Welcome to our forum!
As I know, Microsoft 365 is not supported for Exchange 2010. If there're something wrong when you use Microsoft 365 and Exchange 2010, incompatibility may also have an impact on this. Please install the corresponding compatible Outlook client, such as Outlook 2013.
To further confirm whether the issue is related to Outlook client, please try logging in to OWA and check if it works normally.
Considering impact of windows upgrade, please use the same mailbox to do the same test on win10 and win11 to check if there are differences.
In addition, Exchange Server 2010 reached its end of support on October 13, 2020. For your better user experience, it is suggested that you could upgrade your Exchange server to a newer version.
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ChristyZhang-MSFT 26,126 Reputation points Microsoft External Staff
2021-10-27T06:54:22.973+00:00 Hi @Ion Lascu ,
Just checking in to see if above information was helpful. If you have any further updates on this issue, please feel free to post back.
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Ion Lascu 1 Reputation point
2021-10-27T09:10:36.673+00:00 I confirm that, on windows 10, all office versions (2013, 2016, office 365) are perfectly connected from outside the organization to the 2010 internal exchange server.
Any of these versions(2013, 2016, office 365) installed on windows 11, in the same scenario (outside the organization) cannot connect to the same server exchange 2010.
The problem appeared with windows 11 (either we are talking about the new installation of windows 11, or the upgrade from win 10 with absolutely all the updates up to date). -
ChristyZhang-MSFT 26,126 Reputation points Microsoft External Staff
2021-10-29T09:20:19.773+00:00 Hi @Ion Lascu ,
Thanks for your reply!
Considering the old version of Exchange 2010, I 'm building a win10 + exchange 2010 + outlook 2013 environment and will upgrade to win11 to test. Once the test results are available, I will update them here as soon as possible. Thanks for your patience and support!
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Ion Lascu 1 Reputation point
2021-11-07T07:52:56.73+00:00 Thank you @ChristyZhang-MSFT !
Did you manage to take the tests? -
ChristyZhang-MSFT 26,126 Reputation points Microsoft External Staff
2021-11-09T08:14:14.873+00:00 Hi @Ion Lascu ,
Sorry for taking so long to reply to you!
I would like to confirm if all the users in Windows 11 have this issue now?
Since exchange 2010 has ceased to be supported, I have tried a lot but cannot test in the environment of exchange 2010. According to my test, I found that the followings:
- Outlook.com account + Outlook 365 client + Windows 11---worked
- EXO account + Outlook 365 client + Windows 11---worked
- Exchange 2016 + Outlook 365 client + Windows 11---worked
So I still suspect that this issue is caused by the unsupported Exchange server- Exchange 2010. You could try to enable TLS1.2 in the Exchange 2010 and check if the issue persists. And as I mentioned before, it is better to upgrade it to newer version, such as Exchange 2016 or Exchange Online.
In addition, as far as I know, windows 11 only supports Outlook 2016 and later version. It's suggested that you could update Outlook to newer version.
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Steve Hess 6 Reputation points2021-11-09T13:58:22.197+00:00 Having same issue with Office 2016 Outlook on all machines with Windows 11 but works fine with Windows 10 and prior. OWA works file also.
0 Votes
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Tahsin Çınar 1 Reputation point2021-11-12T14:46:25.947+00:00 Add your Exchange server's MX name to proxy exclusion list. For example : mail.yourorganisation.com
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P.Souce 1 Reputation point2021-11-09T16:55:28.81+00:00 Windows 11 has many bugs, obviously. Recently we were also not able to install our company software running the new Microsoft Installer. Waited about a week, restarted the computer several times, and tried again and now it works. Was also a certificate type error, being misreported I think like here with Outlook and its connection.
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Michael N 1 Reputation point2021-11-17T12:51:41.35+00:00 The problem is that in Windows 11 some Cipher Suites are disabled.
You have to change to min. TLS1.2 in Exchange 2010.