[libreoffice-users] How to edit MS doc(x) files without breaking it for MS?

Hello!

A girlfriend of mine was tired of windows and installed the latest Linux
Mint on her netbook, which comes with libre office.
Although Libre is working generally well, she noticed a problem when
working with Docx and Doc.
If the original file is made in LO, both LO and MS office can change it
without problems.
If the original file is made in MS office, then changed in LO, then MS
office can no longer read it.

After googling, it seems to be a bug in the later versions of LO / Open
office.
We tried to locate a debian based LO of version 3.4 or earlier, but without
success.
All links are either dead, or link to the latest version.
Coincidentally, we fail to install Open Office (in the hope their product
does not have this problem)
even after following multiple tutorials to remove LO first before
installing OO.

Obviously, not being able to interact with documents from MS office is not
an option when the
netbook is to be used at school. If we can't solve this, she will have to
return to Windows just for the
sake of being able to share documents with other (non-technical) students.

How can we solve this?

Many thanks in advance,

ET

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