Therefore Windows and Linux users are waiting impatiently for the jailbreak tools made public for their OS. And this tweet from PosixNinja can appease your weary for awhile. Okey here is the PosixNinja Tweet.
Just wait for a little while, oke guys? :)
Update 1: If you are looking to A5 untethered jailbreak with Absinthe tutorial or looking workaround to fix the bugs after untethered jb with Absinthe.
Update2 : while waiting for Windows version of Absinthe which is so far has no signs to be released shortly, why don't you use CLI Tool to JB A5 device on Windows? Then visit this page to jailbreak iPhone 4s, iPad 2 untethered for Windows with CLI Tool.
Update 3: Absinthe for Windows is already released, dubbed Absinthe v0.2, simply download the tool from these links: Link Or Mirror 1