Didnít pay any attention at the time but when I installed Optional Update KB3035583 back on 3/29/15 it installed a bunch of files.

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Last night I noticed some activity from GWXconfigmanager.exe for the first time. Wondering if anyone else has seen similar activity.

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InfoWorld had an interesting little piece on this update early last month.

Mystery patch KB 3035583 for Windows 7 and 8 revealed | InfoWorld