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There is a good white paper available that gives you invaluable information about 64-bit Office. Here are the download link, description, and table of contents.
Compatibility Between the 32-bit and 64-bit Versions of Office 2010
Summary: For customers working with large amounts of data, Microsoft Office 2010 is now available in a 64-bit version. This article discusses issues around the compatibility of the 32-bit version with the new 64-bit version and legacy 32-bit Office applications and their solutions. (12 Printed Pages)
Introducing the 32-bit and 64-bit Versions of Microsoft Office 2010 Comparing 32-Bit Systems to 64-Bit Systems Introducing the VBA 7 Code Base ActiveX Control and COM Add-in Compatibility Application Programming Interface Compatibility Using Conditional Compilation Attributes Conclusion Additional Resources
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Is it or will it be possible to use Office 2010-64bit version besides older version in 32bit as, as a developer we always need several versions side-b-side
Cees, It won't be possible to have Office 2010 32- and 64-bit installed on the same machine. The Office installer won't allow it.
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