I was wondering exactly how the museum pass is used. For instance we would like to go to the Louvre on Friday late afternoon into the evening and then use it for 4 days. Would we be able to go to Versailles on Tuesday? If they count Friday as day one and it's good for 4 days then we would not be able to use it on Tuesday. But, if they count it from the time on Friday that it is activated then we should still be able to use it to get into Versailles on Sat. morning?
Try posting this on the "West" section which includes France and you should get a response.
In order to activate your pass, you write in your own name and the date you first use it. That date is day one, so if you go to the Louvre Friday night, it is good Friday-Monday.
Yeah some museums arent on the pass, so try to go to one of them on the friday night and then start with the Louvre on Saturday.