NeoOffice (3.1.2 Patch 2 and Patch 0, Intel version) does not work with 'Edit in Office' nor 'Edit in Word'.
While the attached document or Confluence page can open correctly, saving back the content will generate 'General Input/Output Error'. See screenshot.png.
For .xls document, NeoOffice 3.1.2 will not be able to save back to Confluence (you can only choose save as).
The PowerPC version of NeoOffice 3.0.1 also fail. It opens the page up just fine but you cannot save back to Confluence.
Older version of NeoOffice (3.0.1 and 3.0.0 Intel versions) works fine in Confluence (tested with 3.1 and 3.4.3).