Hi all, I'm using Lion on my MacBook Pro 17" (2011 Sandy Bridge model), and I use Menu Meters to track download/upload activity. Annoyingly, this doesn't break down such activity to the process or application, and neither does Activity Monitor. Anyway, my computer is constantly downloading about 50-150 KB/s. This is seriously going to use up my monthly allowance if it remains constant. Any ideas? Has anyone else noticed this? On a separate issue, my MBP won't install the latest Thunderbolt firmware update showing up in Software Update. Random. EDIT: Ok, the problem was Mail. I've told it to omit attachments and now it's behaving. I guess it wanted to download every attachment I've had from 40,000+ emails. Wonderful.