Is the 64-bit version of Office compatible with Access Dimensions?

You are not restricted to a 32-bit version with Dimensions when pulling reports within Dimensions and then exporting to Excel, you can use either 32bit or 64bit of Excel and this would not effect the use of Dimensions.
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However if you are using MAPI to send e-mails from Dimensions through to Outlook then Outlook does require to be 32-bit.
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If you are using AOI then there are certain requirements such as the Excel bit version being 32 bit, or a separate 64 bit ODBC link to use alongside 64 bit excel.