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You will need to either have them install the certificate or purchase and install a trusted one. Which version of Exchange are you running?
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Alternatively, you can issue a cert from your own CA (if you have one) and install this root certificate on all clients through group policy so it's trusted
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When my users go to our webmail server, they are presented with an error that reads &quot;There is a problem with this website's security certificate&quot;, &quot;The security certificate presented by this website was issued for a different website's address.&quot;<br />
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I have no idea how to fix this.
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When my users go to our webmail server, they are presented with an error that reads "There is a problem with this website's security certificate", "The security certificate presented by this website was issued for a different website's address."

I have no idea how to fix this.

Certificate Error

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.

Web Browsers

HTTPS is a protocol for secure communication over a computer network which is widely used on the Internet. HTTPS consists of communication over Hypertext Transfer Protocol (HTTP) within a connection encrypted by Transport Layer Security (TLS) or its predecessor, Secure Sockets Layer (SSL). The main motivation for HTTPS is authentication of the visited website and to protect the privacy and integrity of the exchanged data. HTTPS is widely used for protecting page authenticity on all types of websites, securing accounts and keeping user communications, identity and web browsing private.