OO3 File Extension - Open .OO3 files

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Common File Extensions

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.OO3 File Extension

TIP: Run a free scan for .OO3 file extension errors.

File Type

OmniOutliner 3 File

Popularity

Average

Category

Data Files

File Description

Organizational file that can contain text, checkboxes, pop-up lists, and spreadsheets; some uses include creating to-do lists, managing agendas, tracking expenses, and taking notes

Program(s) that open oo3 files

Mac OS

The Omni Group OmniOutliner 3