New windows 8.1 clients getting certificate error

We are running exchange 2010 and one of our end-users just recently purchased a windows 8.1 laptop.  When he tries to connect to exchange using the built-in mail app, he gets the error, "To connect to this account, you need a valid certificate
on this PC.  Contact your system administrator for more info"
I searched a lot online and found a suggestion of signing into OWA and exporting the root level certificate, then installling it.  I did that, but still receive the error on his machine. 
Any suggestions?

Hi,
Supplementing a blog for your reference:
Supporting Windows Mail 8.1 in your organization
http://blogs.technet.com/b/exchange/archive/2013/10/18/supporting-windows-mail-8-1-in-your-organization.aspx
Hope it is helpful
Thanks
Mavis
Mavis Huang
TechNet Community Support

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