Searching for best practice recommendations regarding connecting Exchange calendars to SP 2010

A user has requested assistancing setting up a web part on SP 2010 to display their "on call" calendar from Exchange.
When she attempted it, she got the error that says, in part, "[...]
This could be due to the
fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case. This could also be caused by a mismatch of the security binding between the client and the server"
I am a bit puzzled as to where to start. The admins for the Exchange server are in another group - it sounds to me like there is some sort of issue going on between SP 2010 and Exchange 2010, but I am not clear on how to proceed so that we can fix it.
I do know that I have noticed in the event logs an Application error event that says that "an operation failed because the following certificate has validation errors" and later "SSL policy errors have been encountered. Error code '0x2'".
In asking around, I was told that the site mentioned elsewhere in the error is a verisign signed site which has chained certificates. I have no idea what specific action triggered the error - the message says
Source: Microsoft-SharePoint Products-SharePoint Foundation
Task Category: Topology
These may be two totally separate situations. I don't understand the certificate concept well enough to be able to determine that.
Does this ring any bells with anyone?

Hi,
Thank you for your question. I am trying to involve someone familiar with this topic to further look at this issue. There might be some time delay. Appreciate your patience. Thank you for your understanding and support.
Thanks,
Linda Li
Linda Li
TechNet Community Support

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