Microsoft Publisher documents can be exported as simply Rich Text Format documents (*.rtf) with several programs, including some online conversion services. Only the texts will be converted, any other graphics elements or special formatting will be lost.
Found 2 different conversion types using the same filename extensions.
Conversion pub to rtf type 1:
Convert from Microsoft Publisher document to Rich Text Format document.
Multiplatform software - convert pub to rtf on any platform
Word processor and text editor from OpenOffice.org suite
File type (from-> to)
Convert from pub file format
Microsoft Publisher document
Rich Text Format document
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned pub to rtf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Full-featured word processing and desktop publishing tool from LibreOffice suite
Conversion pub to rtf type 2:
Convert from Publication document file to Rich Text Format document.
Microsoft Windows software - convert pub to rtf on Windows
One of the first desktop publishing programs on market
Apple macOS / Mac OS X software - convert pub to rtf on OS X
Mac version of once popular publishing program