Tahoma was the default screen font used by Windows 2000, Windows XP, and Windows Server 2003 (replacing MS Sans Serif) and was also used for Skype and Sega's Dreamcast packaging and promotional material. Bundled in the font library of Windows, the typeface was widely used as an alternative to Arial.
In 2007, Apple announced that Tahoma would be bundled with the next version of Mac OS X v10.5 ("Leopard"). Leopard also shipped with several other previously Microsoft-only fonts, including Microsoft Sans Serif, Arial Unicode, and Wingdings.
Мобильные ОСи, линукс - зависит от пользователя, установил он их себе или нет...