Improved customization and better usability compared to 2007.
Hardcore users who insisted on Word 2010 x64 developed creative workarounds: MICROSOFT OFFICE 2010 WORD X64 -thethingy-
While 64-bit allowed for larger documents, it initially caused issues with older 32-bit add-ins, forcing some users to stick with the 32-bit version. End of Support Improved customization and better usability compared to 2007