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The download is available in 32- and 64-bit flavors fromMicrosoft's TechNet Evaluation Center. You’ll need to login with your Microsoft credentials, fill in a form with your name and country of residence, and choose the desired version and language, before being served with a download link and a product key to activate the trial.
Instead of an installer, Microsoft decided to release the software as a disc image. Windows 8 offers native support for .img files, so users already running the latest version of the operating system will be able to access the installer with a simple double-click. Everyone else will need third-party software like ImgBurn or Daemon Tools, both available for free, to either burn it into a disc or mount it as a virtual drive.
Microsoft Office 2013 requires Windows 7, Windows 8, Windows Server 2008 R2, or Windows Server 2012 to run -- Windows XP holdouts are out of luck. Standalone versions will be available at $139.99 for the Home & Student Edition, $219.99 for Home & Business and $399.99 for Office 2013 Professional. The suite will also be available as part of an Office 365 subscription package for either $99.99 or $149.99 per year.