Windows Mail App - Install Certificate

We've installed Windows 8.1 (Enterprise) on to our corporate network, but we're having problems adding an Exchange account to the Mail app.  After entering all the necessary settings (Domain, server, user name etc.) - we get the following error:
To use this account, choose a valid certificate on this PC.  If there isn't one, contact systems administrator. 
We have digital certificate set up on our Exchange, but this doesn't appear to be enough for it connect to the mailbox.
Anyone else experiencing this - any advice??
Thanks

Hi,
Please check the Certificate to see if we have installed the self-signed certificate.
1.  Start > Run, type “MMC” and enter.
2.  In the open window, click File > Add/Remove snap in…
3.  In the Available snap-ins tab, select Certificates > Add > Computer account > Local computer.
4.  Click “Finish” and “Ok”.
5.  Expand Certificates > Personal > Certificate.
Meanwhile, I suggest you refer to Self-Signed Certificates section below.
http://blogs.technet.com/b/exchange/archive/2012/11/26/supporting-windows-8-mail-in-your-organization.aspx
Regards,
Kelvin Xu
TechNet Community Support

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