You're right, it's from a newer version. Perhaps it was saved in a trial version, or she has more than one version installed.
You don't need to worry about fonts and messes when you open it on your own computer.
Open the InDesign file
Use File>Save or Export and choose IDML
The user will be able to open that on their computer, and all fonts, images etc. should relink back just fine.
They can then save it for themselves as an InDesign file as it opens as Untitled.
Thank Eugene, I'll give it a shot. I'm just hoping it maintains the formatting as much as possible.
But what if I do not want to get in the car, driving back and forth for an hour just for exorting the document into a IDML-file... I have already done that once a while ago. Now I'm stuck here at work with a file made on InDesign in the Creative Cloud at home. Here at work I use InDesign CS4 ver. 6.0.6. Go figure Damn it, I pay $$$ for a license at work and still pay $$$ as a private user for the Creative Cloud at home, wich btw works perfectly fine, until I forget to do the IDML-manouver. F*ck.
Guess what. I opend the darn file as a PDF in Illustrator... *sigh*....