1.    27 Jun 2017 #1
    Join Date : Feb 2016
    Posts : 38
    10

    Can I use license key from old laptop, even if its "OA" ?


    I have a broken old laptop.
    However, it does have one useful thing: a Win7 license key.
    Can I use this key to install Win7 on a desktop and upgrade to Win10?

    The laptop authenticity sticker on the underside says its "Home Premium OA" and OA I think means its already activated. So I wonder if I have to "deactivate" it first before activating again?
      My ComputerSystem Spec
  2.    27 Jun 2017 #2
    Join Date : Jun 2014
    UK
    Posts : 1,051
    W10 pro x64 and W8.1 x86

    I don't think so. OA I believe simply means it is a factory OEM (Original Equipment Manufacturer) installation and that means the license key is only valid for that PC. If you attempt to use it then you will just get a failure notice as the key is already in use.
      My ComputerSystem Spec
  3.    27 Jun 2017 #3
    Join Date : Dec 2015
    Posts : 5,940
    Windows10

    Strictly no but Windows 10 is amazingly lenient about such things. Worth a try.
      My ComputerSystem Spec
  4.    27 Jun 2017 #4
    Join Date : Feb 2016
    Posts : 38
    10
    Thread Starter

    I just read somewhere that I have to deactivate a Windows license key, and only then can I re-use it.
    slmgr /upk [your-windows-key]

    https://www.howtogeek.com/124286/how-to-uninstall-your-windows-product-key-before-you-sell-your-pc/
      My ComputerSystem Spec
  5.    27 Jun 2017 #5
    Join Date : Jul 2015
    Posts : 3,724
    10 Pro

    Quote Originally Posted by Bansaw View Post
    I just read somewhere that I have to deactivate a Windows license key, and only then can I re-use it.
    [FONT=monospace]slmgr /upk [your-windows-key]
    Doesn't apply to OEM as you can't reuse it anyway and in any case if the laptop is broken you'll not be able to do it.

    You could try installing 10 and entering your 7 key (you don't have to install 7 and upgrade). It will either work or not. If it doesn't work you could try telephone activation, tell them it is only installed on one computer and see what they say. As @cereberus said according to the license you can't do this but there is nothing wrong with trying.
      My ComputerSystem Spec
  6.    27 Jun 2017 #6
    Join Date : Aug 2014
    Forever West
    Posts : 3,922
    Win10 Home and Pro, Win10 Insider Preview, Win7 Home, Linux Mint

    OA simply means it's an OEM Activated Product Key. From Win7 back, most times a Key from one brand was prohibited from installing on a different brand, especially when using a CD for installing. As mentioned, Win10 changes things.
      My ComputerSystem Spec
  7.    27 Jun 2017 #7
    Join Date : Jul 2015
    Posts : 9,395
    Windows 10 Pro

    Quote Originally Posted by Bansaw View Post
    I just read somewhere that I have to deactivate a Windows license key, and only then can I re-use it.
    slmgr /upk [your-windows-key]
    Pure myth. slmgr /upk only removes the product key from the local computer. It has absolutely no affect on the activation or digital license stored on Microsoft Activation Servers.
      My ComputerSystem Spec
  8.    30 Jun 2017 #8
    Join Date : Dec 2013
    Sydney, Nova Scotia, Canada
    Posts : 10,436
    Windows 10 IoT

    Quote Originally Posted by NavyLCDR View Post
    Pure myth. slmgr /upk only removes the product key from the local computer. It has absolutely no affect on the activation or digital license stored on Microsoft Activation Servers.
    Bingo. Exactly.
      My ComputerSystem Spec
  9.    30 Jun 2017 #9
    Join Date : Dec 2013
    Sydney, Nova Scotia, Canada
    Posts : 10,436
    Windows 10 IoT

    Quote Originally Posted by Berton View Post
    OA simply means it's an OEM Activated Product Key. From Win7 back, most times a Key from one brand was prohibited from installing on a different brand, especially when using a CD for installing. As mentioned, Win10 changes things.
    Factory Windows 7 OEM installs use a Generic OEM key. Dell has their keys, Acer theirs, etc. As an example every Dell with Windows 7 Home Premium will have the same Dell key. Those PC's don't activate online, they activate against a SLIC table in the BIOS. Use a Dell OEM disk on an Acer and the SLIC table won't match, no activation. No SLIC table means no activation too. Those generic OEM keys are also blocked from online activation. Windows 10 won't activate with them either. That being said, that generic OEM key is not the key printed on the COA sticker. That key is unique and its there for use with stock Windows 7 install media. I've had to do a phone activation when using them though. According to the EULA, OEM keys/installs are not transferable.
      My ComputerSystem Spec

 


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