A number of questions have been asked about AECOsim Building Designer compatibility with Microsoft Office 64-bit versions.
The SS6 readme currently states:
"AECOsim Building Designer (SELECTseries 6) is compatible with Microsoft Office 2007, Microsoft Office 2010, Microsoft Office 2013, Office 365 Business and Office 365 Business Premium. Microsoft Office is required to support certain export and reporting capabilities. It is NOT part of the Prerequisites for Bentley Desktop Applications."
Update: The readme for AECOsim Building Designer (SELECTseries 6) Update 1 adds this: Note: AECOsim Building Designer V8i (SELECTseries 6) Update 1 supports Microsoft Office 32-bit versions only.
Office 64-bit does not contain all of the features of Office 32-bit. Microsoft actually recommend that most users install the 32-bit version. The 64-bit version has a role for users with certain requirements, listed in the linked article below. These are primarily those using exceptionally large datasets or documents.
Microsoft's own recommendations are stated here: Choose the 32-bit or 64-bit version of Office
with additional background here: 64-bit editions of Office 2013
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