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[Windows XP FAQ 一覧] - [Windows XPにアップグレードできるOSは何ですか。]
各OSから Windows XP Home Edition,Professional Editionへのアップグレードの可否は以下の通りです。
(1)Windows 3.1
Home Edition ×
Professional Edition ×
(2)Windows 95
Home Edition ×
Professional Edition ×
(3)Windows 98/Windows 98 SE/ME
Home Edition ○
Professional Edition ○
(4)Windows NT 3.51
Home Edition ×
Professional Edition ×
(5)Windows NT 4.0/2000
Home Edition ×
Professional Edition ○
(6)Windows XP Home Edition
Professional Edition ○