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Was the clock on the client machine set correctly?
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Was the clock on the client machine set correctly?

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Today our remote users when trying to check emails have started to get cert errors stating that the certificate is expired, or not yet valid. &nbsp;The problem is the certification is valid, and is valid until Aug 17, 2008. &nbsp;It's issued by THAWTE. &nbsp;<br />
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I've checked the event logs and can't find anything that would be related to this issue.
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Today our remote users when trying to check emails have started to get cert errors stating that the certificate is expired, or not yet valid.  The problem is the certification is valid, and is valid until Aug 17, 2008.  It's issued by THAWTE.  

I've checked the event logs and can't find anything that would be related to this issue.

Error on OWA and active sync says expired cert, when it's not

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

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.

SSL / HTTPS

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.