I have extended my main sharepoint 2010 webapp to provide extranet access.
I can now access my site from the internal network using http://spoint.domain.internal/ and from the outside using http://spoint.mypublicurl.com/
The problem I have is Calendar overlays - If someone creates an overlay from the internal network side, then the URL is wrong for the external users and vice versa.
So, how can we specify the URL for calendars etc so that it works for both user populations?