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Certificate Error for Users accessing Proofpoint Essentials user interface when running Windows XP and Internet Explorer.
 
Problem:

Users who are running Windows XP and using Internet Explorer to access the 
Proofpoint Essentials user interface may get a certificate error. This is due to 
known incompatibilities between Windows XP/Internet Explorer and Proofpoint’s 
web server configuration.

Solution:

Users can ignore the certificate error and proceed to access the 
user interface. Alternatively they can use another browser.
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