How to open OO3 file format? (OmniOutliner 3 File)

Problems with opening OO3 files occur very often among users. Unfortunately, not everyone is aware that the basic and usually the most common problem is the lack of an installed software to handle the OO3 file. Its full name is OmniOutliner 3 File and the company responsible for its development is The Omni Group. Your OO3 file has probably an encoded information from the Data Files category. If you want to view its contents, open, edit or convert the OO3 file to another format, install one of the applications from the list, which is presented below on this page. Can’t you still open your OO3 file? Please, visit file extension oo3 where you will find more information.

Programs using this file extension

Mac OS
– Omni Group Outliner