OEM software does not come with a box or printed manual. Windows Vista Ultimate OEM combines every feature in Vista Home Premium and Vista Enterprise.  It joins an advanced, business-focused infrastructure with a mobility-geared system and consumer-driven entertainment features on one operating system.  If you want all the best business, mobility and home entertainment features, Windows Vista Ultimate is the solution for you. Remember this is an OEM version, not the full product.  It comes with the DVD only, no manual.  If you are not computer savvy and technically inclined, you may want to look into purchasing the full version of this product.  For those who are highly technically inclined, OEMs are a great deal. This 32 bit version is compatible with either a 32 or 64 bit processor.