Question : microsoft, exchange, 2007, one domain name for email for internal and external access

So I have the same issue as a number of folks in regards to Exchange/outlook 2007 and ssl.  I have been reading and trying to understand Sembee's article on exchange 2007 and ssl http://www.sembee.co.uk/archive/2007/01/21/34.aspx .  Please forgive me as I am feeling downtrodden and a bit thick about all of this.  This is a summary of my efforts to understand:

I have my external mail setup and working fine on exchange 2007 at mail.domain.com.  I have a trusted Certificate assigned to the default website.  Internally, Outlook 2007 complains about the name not matching the certificate.  According to sembee, I need to setup a second ip/website and move the external connections to this website.  I then need to use the self signed certificate on the internal/default website.
Question no 1- I've already assigned the Thawte cert to the internal default site.  How do I get the Exchange Self Signed cert back onto it.

According to sembee's article I also need to fix autodiscover.
Question no 2 - I have one domain for internal and external mail. Do I need to setup an additonal website an external autodiscover site?  Can use my existing Thawte cert for this new autodiscover site or do I need to buy another cert?

Question no 3 - I did an nslookup for autodiscover.domain.com and it does not exist.  What dns (internal and external) stuff do I need to do?

I appeciate all you work and knowledge to date everyone.

regards,
flo from TO

Answer : microsoft, exchange, 2007, one domain name for email for internal and external access

Glad you got everything going....... If you not using UM you can remove the virtual directories withe the remove-XXXX command