Microsoft Office — 2010 Professional Plus -64-bit- -pre-activated- _best_

You need the original SW_DVD5_Office_Professional_Plus_2010_64Bit_English_MLF_X16-52535.iso . Verify the SHA-1 hash against MSDN database.

The IT team realized that the "pre-activated" Office 2010 was likely a pirated version, designed to bypass Microsoft's activation mechanisms. They also suspected that the hackers might have embedded malware or other unwanted code into the installation package.

The edition was the most comprehensive version of the 2010 suite, designed primarily for corporate environments. Install Office 2010 - Microsoft Support

. No more fumbling with product keys or worrying about trial periods expiring at the most inconvenient times.