1. In your Google Admin console (at admin.google.com)…
2. Go to Users.
3. Click the user you want in the list.
4. Click Security.
5. Click 2-step verification.
6. Click Get Backup Verification Codes.
7. Copy one of the verification codes.
8. Click Done.
9. Send the backup code to the user in an IM or text message.
   The user can sign in to their account using a password and the backup code.

DNS Records

https://toolbox.googleapps.com/apps/dig/#A/

https://dnschecker.org

MAIL

https://mxtoolbox.com/

www.whatsmydns.net

https://toolbox.googleapps.com/apps/checkmx/

https://www.mydigitaldiscount.com/everything-you-need-to-know-about-slc-mlc-and-tlc-nand-flash.html

You can use most product keys from Windows 7 and Windows 8 to activate Windows 10.

Different ways of activating windows 10.

1. right-click start menu, scroll to bottom and click “change product key or upgrade your edition of windows”, Click “Change product key”
2. Control Panel, System, Click “Change Product Key”
3. Run command “SLUI”
4. Run command “changepk”
5. Open elevated command prompt, type “slmgr /ipk xxxxx”, replace the xxxx with your product key. If it was successful,  a window will pop up saying so.