Laptop Computer and Microsoft Exchange

In the good old days (POP/SMTP) I could have both my laptop and my desktop pick up email, tell the server to keep it for ten days, and have a copy of incoming mail on each.

Now with Exchange it seems to be a competition between the tow to see who can pick the message first.

Occasionally both do, but most of the time it is only one.

Is there an exchange paramater I am missing?

Bob