After speaking to a mac technician, upgrading to Leopard can be thwart with problems. He recommended:

1. Archive Install. ____ Else, 2. Back up all your files, reformat, clean install, then re-incorporate your personal files.

A simple upgrade from an earlier OSX to Leopard can result in internet browser & other problems. eg: unable to access your previous popular sites with your browser. And other issues.

This thread is simply intended as a consideration for those have or are intending to upgrade their OSX to Leopard, not as a hard & fast rule.

Chances are that if you follow the above advice, you will not have any problems running & connecting with LW.