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https://docs.microsoft.com/ja-jp/visualstudio/subscriptions/signing-in
https://visualstudio.microsoft.com/ja/subscriptions/
https://my.visualstudio.com/subscriptions
http://mitomoha.hatenablog.com/entry/2017/06/05/000726
https://knooto.info/visual-studio-subscriptions-downloads/
https://www.ipentec.com/document/software-vlsc-msdn-license
https://opcdiary.net/?p=32989
https://www.licenseonline.jp/qq2/licenseonlinestorefront/ProductDetail.asp?BrandID=6&EQPID=20
https://qiita.com/shigezo/items/008572c32334e55818b4
https://ja.wikipedia.org/wiki/Microsoft_Developer_Network
https://gigazine.net/news/20090424_msdn_subscription/
http://www.mukeshkumar.net/articles/visualstudio/get-or-activate-your-msdn-subscription
https://tsmatz.wordpress.com/2014/11/21/msdn-subscriber-office-365-api-dev/