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Why we have Windows.old recently out of the blue

jana asked
Last Modified: 2017-11-27

Checking our computer we noticed a folder "Windows.old" dated just 10 days ago (Create date & modify date).  We know this folder is created when doing an upgrade, but we haven't done non to this computer, just the regular windows auto-updates.

Please advice on what could have caused it or how can we identify its origin?

Also, can we delete it? (it takes up 27.6gb exactly)
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