Complex sentence: Office Starter 2010 was only available to original equipment manufacturers (OEMs) to preload on Windows PCs and was intended as a replacement for Microsoft Works; it is only compatible with Windows Vista and Windows 7.
Split into simpler sentences: Office Starter 2010 was only available to original equipment manufacturers (OEMs) for preloading on Windows PCs and is intended to replace Microsoft Works. It is only compatible with Windows Vista and Windows 7.