[jsalh]

When you set up your email - are you using a POP3 or IMAP. If I understand correctly, POP3 downloads email from the server and then deletes it from the server or keeps for x amount of days. Whereas, IMAP allows you to keep everything in sync - so for example, I have a TELUS (ISP provided) email address… I have my PC and my TP2 downloading emails from TELUS. If I log into TELUS's server - I can see all the emails as well, but if I delete one email from my PC - it will delete it from the server, which will delete it from my TP2; in short it keeps all multiple email destinations in sync.

Google also does the same - you can setup Gmail with POP3 settings or IMAP settings.