I set up Google Apps for my domain to let them handle my email. The control panel of the account has a setting that indicates what happens to an email once it is retrieved via POP3.
When messages are accessed with POP is set to Keep copy in inbox.
Once my mail client retrieves the message, I can see still see it if I log on via the web-interface (that's good). However, if I am using another POP3 client to connect to the same account - the mailbox is empty. In other words, as soon as a client gets a message, it becomes unavailable for other mail clients.
Regular GMail accounts don't behave that way - I can receive the same email on all of my email clients, and it is kept on the server too.
Is there a setting I can rely on to make Google Apps behave like GMail?