Lucas Miller tackles an Error Exporting to Excel from Business Portal 5.1 for Microsoft Dynamics GP 2010 in Internet Explorer 9
Error Exporting to Excel from Business Portal 5.1 for Microsoft Dynamics GP 2010 in Internet Explorer 9 – Microsoft Dynamics GP Support Blog – Site Home – MSDN Blogs
Microsoft & the GP EcosystemExcel & OfficeInstall, Upgrade & AdminGP 2010
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.