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Nanami Madobe (窓辺ななみ)Nanami Madobe is the official OS-tan of Windows 7. She is the first official "OS-tan", in that she is marketed by Microsoft. 7777 Premium bundles of Windows 7 Ultimate DSP sold in Japan include a Madobe Nanami theme pack, complete with sound files and three wallpapers.
Her name is a play on her voice actor's, Nana Mizuki, as well as Windows 7. The Kanji characters in her surname literally translate to "By the window", and her first name is also a play on "Nana", the Japanese word for 7.
In Madobe Nanami no Windows 7 de PC Jisaku Ouen, she is computer store employee.
Nanami has her own Twitter account.