Microsoft Network Monitor 3.0 (hereafter referred to as "NM3") was one of the first applications that worked on released version of Windows Vista, (both 32 and 64 bit).
Weeks after release MS uncovered an issue with NM3 running on Windows Vista. Specifically, MS had a new driver on Windows Vista that was forced to expire after a fixed period of time for our beta builds. Inadvertently, MS left this forced expiration code in our Release build. The NM3 driver on Windows Vista will stop working after April 2007.
If you are running NM3 version 3.0.0372.0000 on Windows XP or Windows Server 2003, you will NOT encounter this issue and you DO NOT need to upgrade to this release.
If you are running NM3 version 3.0.0372.0000 on Windows Vista, it is advised that you DO upgrade to this release.
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Source : Bink.nu
