It's not clear what you mean by "details", but in general EW4 will not properly handle web page objects created with the FP Extensions (typically Shared Borders or Navigation Panes.) If your pages have either of these in them you need to remove them and replace them with standard HTML objects. People typically uses DWTs to replace shared borders.
Navigation Panes are more trouble. EW4 has no way of generating these so you might want to look for a 3rd party product that generated navigation bars that you can plug into your pages. You'll get a long list of options if you Google "CSS Menus".