All my keys from keysworld.com are now useless. They are a money pit.
I have purchased many keys from Keysworlds.com for Windows, and especially Office for computers. Unfortunately, ALL of them no longer work. If you have to reinstall Office for any reason, have to reinstall Windows, or change hardware in your computer, the key no longer works. Microsoft refuses to accept the key with the reason: "This product cannot be activated because the product key is not valid" Microsoft also will not acknowledge the ownership of Office in their customer portal, even though the key initially worked. So all those keys I purchased from Keysworlds.com? Useless. Keysworlds.com kept the money, and will not issue any new key. Their official response: "After reinstall, the key wouldn't be used again, please kindly buy other new keys for your computers" So my conclusion: It you want to give your money away, never get support, and never have your purchased key usable ever again, then by all means, give them your money. For me: Microsoft now funnels people to paid yearly 365 memberships. I now use Libre Office or OnlyOffice. Both are free for home use, compatible with Office docs, and interchangeable when working with others who have Office.