Unable to access Exchange 2010 public folders from Exchange 2016 mailboxes

I'm unable to access Exchange 2010 public folders from Exchange 2016 mailboxes in one of our sites.  

I followed this article and 2 of the 3 sites are OK. 1 site is having the below problem. https://technet.microsoft.com/en-us/library/dn690134(v=exchg.150).aspx

When browsing public folders from Outlook within the problem site, I'm prompted to enter credentials and receive the following error message: "There is a problem with the proxy server's security certificate. The name on the certificate is invalid or does not match the name of the target site webmail.domain.com . Outlook is unable to connect to the proxy server. (Error code 0)"

Has anyone seen this before?

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Neeraj BishtCommented:

There are 3 Methods

1: Examine the certificate.

2: Install the trusted root certificate.

3: Disable the third-party add-in or the third-party browser add-in.

Get help from : https://support.microsoft.com/en-in/help/923575/error-message-when-outlook-tries-to-connect-to-a-server-by-using-an-rp
Hasin Ahmed ChoudharyExchange AdministratorCommented:
If site name is different to SSL cert, you may stop outlook to check cert.
Get-OutlookProvider expr | Set-OutlookProvider -CertPrincipalName NONE


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BYSAuthor Commented:
Actually just discovered I'm only seeing this problem with Outlook 2010/Exchange 2016 mailbox/Exchange 2010 public folders.  Outlook 2016 is fine.
Hasin Ahmed ChoudharyExchange AdministratorCommented:
Have you verified if the outlook 2010 connection from that site is MAPI or RPC/ HTTP?

DO you have necessary KB installed for outlook 2010 to support MAPI?

When that pop-up comes up, can you run connection status? What is the status of PF at that time?
Neeraj BishtCommented:
BYSAuthor Commented:
The Outlook Provider config needed to be removed and Outlook Anywhere needed to be enabled on all 2010 CAS servers.  Thanks for your help!
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