This is a legitimate edition of Microsoft Office sold in stores. The term "Blue Edition" is a famous label used by software crackers (specifically the "WZOR" group) to distribute a pirated, pre-activated version of Office 2010.
: Unofficial distributions often contain malware, trojans, or spyware designed to steal sensitive data or compromise your system. This is a legitimate edition of Microsoft Office
If you maintain a vintage PC running Windows XP SP3 or Windows Vista, the 32-bit Blue Edition is one of the last great productivity suites that runs natively. This is a legitimate edition of Microsoft Office