Paris to Versailles

Metro Line 4 from Vavin station to St Michel, followed by RER line C to Versailles. Take a train labelled VICK on the front to Versailles. Note that you need to get a specific ticket to Versailles - probably available from the machines at Vavin but if not you will need to buy a new ticket at St Michel.

Thank you Philip. Is the connection from the Metro at St. Michel to Train C to Versailles in the same building?

Here is a link to the Metro/RER website. I found it very useful on planning our journey to Versailles. We put in the address for our apartment and told us which metro to get to the closest RER station to us, then what RER from there. Very easy to use.

http://www.ratp.fr/en/ratp/c_21879/visiting-paris/

Yes, when you get off your line 4 train, you'll see signs indicating the way to the RERC. Make sure you know which direction (i.e. which station is at the end of the line) you'll need.

Is the connection from the Metro at St. Michel to Train C to Versailles in the same building?

I think you misunderstand underground railways. There are no "buildings". They are underground, meaning the stations are tunnels beneath the earth and you just follow the signage to get to the RER C, direction Versailles. Before leaving from Vavin, buy tickets going to Versailles. You will need the ticket to exit the station at Versailles.

Make sure you take the correct train, there are two stations in Versailles. If you don't catch the name VICK on the RER-C, then the station is Versailles - Rive Gauche (R.G.).

Enjoy

Thank you all for your responses. We now have a plan and go forth confidently!