Looking at the website its not clear to me is the Hall of Mirror is closed for renovations?!?!? Anyone visit recently ?
They've been working on it since 2003. It has never been closed, though when we were there in May 2003 it was pretty much gutted. Since I plan to visit next month, I did some research. The renovation company's website is in French, and I think I mostly understood it. The work in the Hall of Mirrors is nearly done, just some finishing work is left. They're going to have an official grand "reopening," but they didn't give a date.
I was there on March 16 with the RS Paris City tour and the Hall of Mirrors is very much open, although some of it was covered with scaffolding and other building materials. It's very spectacular, especially when the chandeliers are lit.