Fetching Mail from Exchange 2010

Fetching Mail from Exchange 2010

We upgraded our Mail from Exchange 2003 to Exchange 2010 SP1 this weekend.
From a SDP8 point of view we can now longer not fetch emails, but yet we can still send from SDP8
I have enabled IMAP on port 143 but when we try to save the setting we get the following message:
FAILURE :E-mail settings saved successfully. Could not find valid certification path to requested target, so kindly configure to apply Trusted/Self Signed Certificate.
 
Our certificates are issued by a CA (Verisign)
 
All other information is correct all we did was change the server IP Address from Exchange 2003 to Exchange 2010.
 
From my server we can telnet through to port 143 and can trigger emails to be sent via telnet
 
How do we resolve this? I cannot seem to find any sort of resolution on the Forums.
 
Just by the way I did generate a Support file and have sent it off to the email address but no response. Do we not get SR request number?
 
Screen dump of the error attached.

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