question

QuentinRoberts-4311 avatar image
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QuentinRoberts-4311 asked joyceshen-MSFT answered

Cannot open Exchange 2010 Mailbox from Exchange 2016 OWA

Environment:
Microsoft Exchange 2010 Version 14.3 (Build 123.4)
Update Rollup 32 for Exchange Server 2010 Service Pack 3 (KB5000978)

Microsoft Exchange 2016 Version 15.1 ‎(Build 2242.4)
CU 21 for Exchange Server 2016

Issue:
In the process of migrating from Exchange 2010 to Exchange 2016. Currently able to open mailboxes that are on Exchange 2010 with Exchange 2010 OWA and open mailboxes on Exchange 2016 with Exchange 2016 OWA. Mail is flowing correctly to/from Exchange 2010 and Exchange 2016, and external emails are flowing to/from Exchange 2010 and Exchange 2016 correctly.

However I cannot open an Exchange 2010 mailbox using Exchange 2016. I am trying to make the Exchange 2016 server the client access server and do not want to proceed if I cannot open Exchange 2010 mailboxes from Exchange 2016 OWA.

When I attempt to login to an Exchange 2010 mailbox on Exchange 2016 OWA I am able to authenticate but when OWA attempts to access the mailbox I get the following error:

URL: https://EXCH2016.domain.local/owa/auth/errorFE.aspx?CafeError=CAS14WithNoWIA

:-(
Something went wrong
We can't get that information right now. Please try again later.
X-FEServer EXCH2016
Date:16/07/2021 14:31:53

2 things above give some form of explanation of the error:
The URL has errorFE.aspx?CafeError=CAS14WithNoWIA in it
The server returns error X-FEServer EXCH2016


I know that I cannot access Exchange 2016 mailboxes using Exchange 2010 OWA but I should be able to access Exchange 2010 mailboxes from Exchange 2016 OWA. I have tried using different mailboxes on Exchange 2010 to access from Exchange 2016 and I am getting the same error for those as well.


Solution:
I fixed the error. I had to enable Windows Authentication on the Exchange 2010 server by doing the following commands:

Get the OwaVirtualDirectory settings:

Get-OwaVirtualDirectory -Identity "EXCH2010\owa (default Web site)" | fl

WindowsAuthentication was false.

Set-OwaVirtualDirectory -Identity "EXCH2010\owa (default Web site)" -WindowsAuthentication $true

I am now able to login to Exchange 2010 mailboxes using Exchange 2016 OWA

office-exchange-server-administrationoffice-exchange-server-mailflow
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1 Answer

joyceshen-MSFT avatar image
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joyceshen-MSFT answered

Hi @QuentinRoberts-4311

Glad to know that you have fixed the error and thanks for sharing the information above!

Here I will provide a brief summary of this post so that other forum members could easily find useful information here:

Issue Symptom:
Cannot open Exchange 2010 Mailbox using Exchange 2016 OWA
Something went wrong
We can't get that information right now. Please try again later.

Solution:

 Set-OwaVirtualDirectory -Identity "EXCH2010\owa (default Web site)" -WindowsAuthentication $true

Here is also a related article discussed about the similar issue, we could also refer to this link to get more detailed information:
Exchange 2010 to Exchange 2016 Co-Existence migration OWA redirect not working

Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.


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