What Is Windows.old Folder?
Did you upgrade your setup to Windows 10 from an old version of Windows or update Windows 10 recently?
So what is Windows.old and what does it do?

Here,MiniToolwill introduce it to you.
The Windows.old folder is not new on Windows 10.
The system can use Windows.old folder to undo the changes if the upgrade process fails.

Whats more, there is one important thing you should probably know about Windows.old folder.
After that, you might only reinstall the system back to the previous version.
How to Delete Windows.old Folder?
So you may want to know: can I delete Windows.old folder and is it safe to delete Windows.old?
Actually, deleting Windows.old folder wont affect the present state of your new operating system.
But youd better double-check that there is no important file in this folder before you remove Windows.old folder.
So how to remove Windows.old folder?
The simplest method you could take is to useStorage sense.
Here is a quick guide:
Step 1: Press theWin+Ikeys at the same time to openSettings.
Step 2: ChooseSystemand then clickStorage.
Step 3: Click theChange how we free up space automaticallyoption under theStorage sensesection.
Step 4: Check theDelete previous version of Windowsoption under theFree up space nowsection.
Further Reading
Similarly, there is another choice you might take to delete the Windows.old folder using Storage sense.
Here is the tutorial:
Step 1: Click theFree up space nowoption under theStorage sensesection.
Step 2: Check thePrevious Windows installation(s)option.
Step 3: ClickRemove files.
After finishing these steps, you’re able to remove Windows.old folder successfully.
In addition to the methods mentioned above, there are other methods it’s possible for you to take.