Can't login Lync suddenly, the error is" There was a problem acquiring a personal certificate required to sign in."

Dear all,
This is a real issue in working. Our company provides office 365 mailbox and its lync for users.
Recently, many users meet such issue of " There was a problem acquiring a personal certificate required to sign in."
The lync version is 2010 and even I removed lync2010 cache for user's profile, that user still can't login lync.
See below picture.
Please give help and show advice.
Franklin hong

Hi,
The issue may be caused by that the user’s security credentials were corrupted or an RSA folder on the user’s computer may be blocking authentication.
Here is a similar case may help you:
http://community.office365.com/en-us/f/166/t/80399.aspx
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

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Can't login Lync suddenly, the error is" There was a problem acquiring a personal certificate required to sign in."

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