I'm using the latest Phone Explorer (1.5.9) - which is excellent by the way
I use Thunderbird 1.5.0.9 for mail and contacts.
Just getting the contacts from t'bird into your explorer.
This worked fine for names and numbers, but none of the addresses came through.
I have he SEw810i and at first, being unfamiliar with the phone (just got it a month ago) I thought the same thing.
But when i opened a particular entry which was synced via MPE and Thunderbird, I realised that all the additional information was there and could be seen by going into the entry and scrolling the |left| key and going through the additional fields of the entry like web, home, work,
It might be helpful to give information about your phone also, so that other users may be able to help in a more effective way