I am running 64-bit (x64) OS, such as 64-bit Windows 7 also 64-bit capable CPU processors, i would like to install 64 bit office 2010 ability to take advantage of more virtual and physical memory. Microsoft obviously does not think 64-bit Office 2010 is a good bet for average users. According to TechNet document, the main advantage of native 64-bit versions of Microsoft Office products is the ability to take advantage of more virtual and physical memory that can be installed on 64-bit systems (see differences between 32-bit and 64-bit Windows), allowing users to work with much larger data sets than they could previously, and to analyze and solve large computational problems. For example, this additional capacity is needed only by those Microsoft Excel users who require Excel spreadsheets that are larger than 2 gigabytes (GB). The disadvantage of 64-bit Office 2010 is mainly on add-ins, extensions and ActiveX controls compatibility, which mostly developed for 32-bit Office and will not function in the 64-bit edition. I would like to get your opinions and experience which is very valuable for my final decision.