Microsoft Office 2010 | Excel X64 -thethingy-

Microsoft Office 2010 Excel x64 — Deep Blog Post

Overview

Microsoft Office Excel 2010 x64 is the 64-bit build of Excel 2010, released as part of Office 2010. It was designed to take advantage of 64-bit processor architectures and larger system memory, providing improvements for heavy-duty calculation, very large workbooks, and advanced data models compared with the 32-bit edition.

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Millions of legacy macros broke overnight. The fix? Conditional compilation flags (#If VBA7 Then...). But many companies simply stayed on 32-bit Office. Microsoft Office 2010 Excel x64 — Deep Blog

Power Pivot itself was a game-changer (in-memory columnar database inside Excel), but its 64-bit version was initially buggy. The fix

3. The Catch: Compatibility Hell

3.1. ActiveX and Controls

Many third-party ActiveX controls (buttons, calendars, tree views) were compiled as 32-bit only. In 64-bit Excel, they simply failed to load or crashed the ribbon.