Meira
I pretty much think we've nailed down your problem (hope that's not premature).
I have upgraded many documents, and not run into problems yet.
I even saw a macro somewhere the other day that will scan your hard drive for files and upgrade all of them.
Having said that, you have a problem with clients still working with the old version of Word.
If only it were as simple as telling them they really need to upgrade! :-)
My memory of Word 2003 is getting a little sketchy, as you can imagine. I think I last worked on Word 2003 in about 2009 or 2010. Unless the feature has been included in a patch, I do not think that Word 2003 will be able to open the *.docx files. I seem
to recall that when 2007 was released, Microsoft did release a tool that would allow 2003 to open but not edit *.docx files, but even my memory of that is scant (I never used the tool). I don't even know if it would be available for download any more--I wouldn't
actually be surprised if it wasn't--we are now 12 years and three (almost four) versions on from Word 2003, after all!
I suppose the best option for you is to try this:
- Open and upgrade the document.
- Do your stuff.
- Before sending it to the client, save it in the old *.doc format again.
- [Optional] While sending it to the client, gently hint that they might consider upgrading... :-)