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I am attempting to use Outlook on my android phone. When I attempt to add my email account to outlook (on my phone) I get an error that says: Your mail certificate is invalid. Would you like to login anyway. PLEASE HELP!!!!
Using Outlook for Android in business environments for email and scheduling
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Try re-booting your Phone or Tablet, this is what someone did and suggested it to me and it seems to have solved the problem.
i have read all of this stuff and it is absolutely no help whatsoever. my email settings are correct.
As of 7PM EST time, not just the Outlook app but the native iPhone app is no longer working.
We are getting errors from the native email app on the iPhone.
Cannot Get Mail. Server error.
Also, users are complaining about messages downloading.
I have On Premisses Exchange 2010 and my users have Outlook App in Android and IOS, and also have problem.
I found this article, when my Intermediate Certificated have problem.
https://www.theregister.co.uk/2018/02/07/beware\_the\_coming\_chrome\_certificate\_apocalypse/
https://blog.mozilla.org/security/2018/03/12/distrust-symantec-tls-certificates/
I ask Symantec, and they confirm the problem.
I'm running Exchange 2013 internally.
Currently on CU17. Outlook client broke.
I'm now in the process of upgrading to the latest CU20 (released March 2018).
Stay tuned....