We have installed Office 2013.

We have made a service that connects to SharePoint, retrieves mail and convert those mails to PDF.
To convert we use a third party application, that uses Outlook to open the mail and then convert it.

But once in a while Outlook crashes and the following error appears in the Event Viewer:

An operation failed because the following certificate has validation errors:\n\nSubject Name: CN=outlook.com, OU=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=WA, C=US\nIssuer Name: CN=Microsoft IT SSL SHA1, OU=Microsoft IT, O=Microsoft Corporation, L=Redmond, S=Washington, C=US\nThumbprint: 97CF22E92FB6BAF9162523C32E29490974804888\n\nErrors:\n\n The root of the certificate chain is not a trusted root authority..

We already installed the certificate.

If we check https://outlook.office365.com/EWS/Exchange.asmx (which we contact to retrieve the mail) in the browser for certificates it says:

Baltimore CyberTrust Root
    Microsoft IT SSL SHA1
        outlook.com

And they are all still valid.

In the Trusted Root Certification Authorities - Certificates folder there is also a Baltimore CyberTrust Root certificate.

Is there anything we need to install or set, to get rid of the error?

- Edit -

We followed the steps found here

http://www.thorntontechnical.com/tech/sharepoint/configuring-certificates-and-trust-in-sharepoint-2010-for-accessing-exchange-web-services#.VVrp2Xkw-Hs

We haven't restarted the SharePoint services, because we have to wait until after office times.
If it works I will update this post tomorrow.

• Edited by WSPWesley Tuesday, May 19, 2015 8:27 AM
• Moved by Franklin ChenMicrosoft contingent staff Wednesday, May 20, 2015 3:35 AM Outlook IT Pro

see:

http://blog.armgasys.com/?p=476

https://support.microsoft.com/en-us/kb/2545744

http://sharepointontop.blogspot.com/2012/05/problem-root-of-certificate-chain-is.html

it looks like a sharepoint SSL issue, you should post this question in the sharepoint forum:

https://social.technet.microsoft.com/Forums/office/en-US/home?category=sharepoint

Thank you for the info.

I will check your links and if I can't find a solution, I will try the SharePoint forum.