If by latest OS patches you mean - does SAP retest MII every time MS puts out a new patch or critical update, then the answer would be no (probably not overly surprising).
This would be more impacted in 11.5 because of IIS and the only-Windows operating system, but with v12.x and the platform/OS combinations supported by NetWeaver, MII is really abstracted from the O/S through NetWeaver so that would be the angle to pursue with regard to re-testing and validation. I most assuredly cannot speak to the validation process for NetWeaver pertaining to operating system patches and updates, but I would assume OS service pack levels would be dealt with according to release cycles, but it would be very reactive for every patch that comes along for each of the operating systems in the matrix (http://service.sap.com/pam).
Regards,
Jeremy
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