Normally when you look software on Wikipedia you can find information regarding the version numbers of a product and what the differences are between versions.
In the JET Wikipedia page I found the corresponding MS Access version and expected to find the corresponding JET engine version number…but it was not there, instead a there is dash!

Scanning the text of the article a bit I find that:
“Jet has been included in every version of Windows from Windows 2000 to
Windows 7…Access 2003 relied on the Jet
engine component of the operating system for its data storage and
query processing.”
– Wikipedia, Microsoft Jet Database
At this point I’m not certain if the versions of Windows 2000-7 includes the Windows Server versions as well.
And if it does include them, then what version of JET would MS Access use on Windows Server 2003 Enterprise Edition SP2?
How to determine the current release level of Jet 4.0