"AbiWord has always had excellent support for many file
formats, but one of the best things about the new version is that
it supports Office Open XML filters, and that means you can open
and edit both Microsoft Word 2007 and OpenOffice Writer files with
it. Here's more on what's under the hood.
"The full list of improvements and bug fixes in the new version
of AbiWord is found here. There are many improvements to the LaTex
export filter, including support for exporting equations."