Now a new windows.old after November update

[dpomerance]

After doing the major update I now have a 12G windows.old folder. Can I just blow it away after being sure everything is working okay or will it go away by itself?

 

[Amit Mishra3]

You can blow it away... That's your old windows which you should've formatted while installing update. N it will not go away by itself.

 

[rafal soboczynski]

After doing the major update I now have a 12G windows.old folder. Can I just blow it away after being sure everything is working okay or will it go away by itself?

Had the Same problem after Nov update, but my folder took 20+ gb. I've used disk cleanup tool to get rid of it

 

[sulistyarso]

After a month it will deleted automatically

 

[orlbuckeye]

It uses that file to go back to the upgraded OS. (windows 7 or 8.1)

 

[TechFreak1]

This folder is for the old windows install as mentioned previously and can be removed using the disk clean up utility. However I would suggest not removing it unless you really know what your doing and don't mind not be able to roll back with in 30 days.

 

[Dave47]

You can blow it away... That's your old windows which you should've formatted while installing update. N it will not go away by itself.

As others have said Windows.old will automatically go bye-bye after 30 days. And a citation from our friends in Redmond.
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Delete your previous version of Windows

One month after you upgrade to Windows 10, your previous version of Windows will be automatically deleted from your PC. However, if you need to free up disk space, and you’re confident that your files and settings are where you want them to be in Windows 10, you can safely delete it yourself. Keep in mind that you'll be deleting your Windows.old folder, which contains files that give you the option to go back to your previous version of Windows. Deleting your previous version of Windows can’t be undone.
1.Go to Start, enter Settings in the search box, and then select Settings.
2.Select System > Storage > This PC and then scroll down the list and select Temporary files.
3.Under Previous version of Windows, select Delete previous versions and then select Delete.

 

[Omnitographer]

Everyone saying this is from the old (vista/7/8/8.1) Windows install is wrong, you're missing where the op said it appeared after the update. I also got one of these after the november update and my install was a fresh 10 to a brand new ssd. Threshold 2 was like the 8 to 8.1 transition, and generated a .old folder, but this folder will not contain vista/7/8/8.1. Removing this folder will prevent you from rolling back to the original flavor of 10.

 

[TheCudder]

Everyone saying this is from the old (vista/7/8/8.1) Windows install is wrong, you're missing where the op said it appeared after the update. I also got one of these after the november update and my install was a fresh 10 to a brand new ssd. Threshold 2 was like the 8 to 8.1 transition, and generated a .old folder, but this folder will not contain vista/7/8/8.1. Removing this folder will prevent you from rolling back to the original flavor of 10.

This. This is also why people who have upgraded from Windows 7 / 8x in the last 30 days won't see the November update, as it will replace the existing Windows.old (for restoring to Windows 7/8.x) with a newer Windows.old (for restoring to Windows 10 TH1 / 10240 RTM).