Don't know about 7 but the way to do it in 5.5 is..
record a continuous macro that does view in addressbook then moves down one line.
Goto the address book and pick, view -> clear list.
Goto the opportunity window and bring up all your inprogress opportunities. Now run the continuous macro for the number of times that there are opportunities.
You address book list now consists of all companies with in progress opportunities, you can now use the eport feature