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Have you tried the new importer in 2.1, which you have to explicitly enable? If that fails, too, I'm sure they'd appreciate some files demonstrating the failure...

Microsoft Project Import/Export

OmniPlan 2.1 ships with completely rewritten Microsoft Project import and export and can now export .mpp files. By default, we continue to use the old code, but if you would like to help us debug the rewritten import/export code, use this hidden default:

defaults write com.omnigroup.OmniPlan2 UseNativeMSPFilters -bool true
defaults write com.omnigroup.OmniPlan.MacAppStore UseNativeMSPFilters -bool true

To return to the app's default settings:

defaults remove com.omnigroup.OmniPlan2 UseNativeMSPFilters
defaults remove com.omnigroup.OmniPlan.MacAppStore UseNativeMSPFilters

Supported import formats are MPP 2003, 2007, 2010 and MSPDI (XML) 2003, 2007. Supported export formats are MPP 2010 and MSPDI (XML) 2007.