Framework4 is correct
Quote
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There is no version of Word for the PC named 2005.
It is
95
97
2000
2002 aka XP
2003
2007
2010
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Personally I generally eschew the use of RTF format. Real Text has it's own set of problems.
I would recommend saving the document on the PC using the 'save as' command and simply save as an Office 97 - 2003 .DOC.
This can be opened by just about any Word processing program currently in common use, MS or open source. MS Word for MAC included. (Open Office mimics MS Office 2003.) The possible exception would be Word Perfect(TM).
Also by doing this you avoid the problem of .DOCX incompatability. Some versions will heve the ability to handle commenting/editing/versioning better than others but MS products back as far as XP have the capability. In some cases it just needs to be 'turned on'.
Whether or not that is the case with Word for MAC I do not know. I'm pretty much a PC person and have had limited exposure to MAC.
Office 95, 97, 2000 were more limited than the later versions.
Artemis suggestion of using colored fonts imbedded within the text is an excellent alternative which eliminates all compatability issues.