Front end issue (how to handle the existing work along with new one)

We have upgraded a copy of our production system and are analyzing different pieces to make sure that we have enough confidence in moving ahead. We are getting a good feel in the back end activities but do have many questions in Front end area, such as

· What is the best way to handle existing excel reports yet at the same time providing users ability to create new queries and excel reports. Currently users are using Bex browser to access reports but this is no longer supported for new reports.

· Do we must have portal configured in order to access the new features?

· Is there a risk if users open the existing workbooks with the help of new analyzer?

· Is there a risk if users open the existing queries with the help of new query designer?