Forum Discussion
Certificate Error
Couple of my users are receiving this error for outlook.office365.com in Outlook 2010. Any ideas?
Hi,
I am assuming you have recently migrated to O365. Please get users to run this O365 diagnostic tool which will pick O365 certificate and create outlook profile. https://diagnostics.outlook.com/#/ if they have O365 valid exchange subscription plans.
Alternatively you can also use this tool for Office 365 Desktop Setup Tool for Office 2010 and Office 2007 https://www.microsoft.com/en-us/download/details.aspx?id=50360
Also look this KB https://support.microsoft.com/en-gb/help/3007582/certificate-error-message-when-you-start-outlook-or-create-an-outlook-profile
Please let me know if this solves issue.
No, our email has been in Office365 for 2 1/2 years now.
We haven't seen the error since it first occurred so I'm going to pressume it was a temporary error on the server side.
Up to you but would recommend to get users with older version of outlook to run this tool to get latest updates from 365. https://www.microsoft.com/en-us/download/details.aspx?id=50360
Been O365 Support Engineer, we had few customers having issues.
Our Office 2010 is already up-to-date.
