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In the recently released Exchange 2007 Service Pack 3, there’s a version mismatch between the Outlook Web Access (OWA) S/MIME Control, an Active X control used to provide S/MIME support in OWA. After you install SP3, users who have the control installed will get prompted to install the latest version of the control.
The way this works – the code compares the “Version” property of the client S/MIME control (MIMECTL.DLL) on the user’s computer with the ProductVersion property of the MSI file (OWASMIME.MSI) on the Client Access Server.
During the released SP3 build, the version of the MSI file was incremented to 184.108.40.206. However, due to an error, the DLL file in the MSI retained its old version number (220.127.116.11). As a result, when Outlook Web Access users using Internet Explorer use S/MIME functionality, they get the same prompt to upgrade the S/MIME control even after they’ve upgraded.
Here are two ways to resolve this issue.
After you use either of the above methods, restart IIS. (Use the IISReset command.)
We apologize for any inconvenience this may have caused users.
Update: The issue has been fixed in Update Rollup 1 for Exchange Server 2007 Service Pack 3