Office 2010 Compatibility

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WinCalendar is fully compatible with both 32-bit & 64-bit Windows (Vista / 7 / 8 / 10) however WinCalendar will is not compatible with 64 bit Microsoft Office 2010.  WinCalendar will only work as a stand alone Windows pop-up Calendar if 64 bit Office is installed.  WinCalendar will not be available as a Calendar Maker if 64-bit Office is installed.

Per Microsoft, the 64 bit Office is recommended for "Excel expert users who work with Excel spreadsheets that are larger than 2 gigabytes (GB)". Source:

Accordingly, if you don't work with spreadsheets that are larger than 2 Gigabytes (= 2,000,000 KB), you may want to consider switching to 32-bit Microsoft Office.  Note 32-bit Microsoft Office is supported on both 32 & 64 bit Windows.

Microsoft Office 2010 usually comes with both 32 & 64-bit Setups.  A full Uninstall of 64-bit Office is needed to install 32-bit Office/Excel.