Managing the Same Email Inbox on Two Computers
This article addresses the issue of managing the same email inbox on two computers as many of you would like to know why the e-mail you download on one PC doesn’t turn up on the other. Here’s the answer to this why and it’s described while considering the outlook being your main mail client for both PCs.
Accessing a standard, POP e-mail account on two separate computers is sure to bring troubles. When you download the mail, your e-mail client (Outlook) removes the messages on the server. Therefore you come up with a different set of messages on each PC.
The nicest solution would be to tell your client to run off the messages on the server, if only for one or two days. In Outlook 2007, follow these guidelines:

Select Tools
Then Account Settings
Double-click your account.
Click More Settings,
Then the Advanced tab
Check Leave a copy of messages on the server.
Handle the options below as you desire,
Then click OK,
Then Cancel to get out of the wizard,
Then Close.
And your job is done!
Another option:
Check with your e-mail host and see if they support IMAP. Like POP, IMAP is a standard e-mail protocol. But unlike POP, it syncs your client (and yes, Outlook supports IMAP) with the server, rather than just uploading and downloading.
But the finest solution, in my opinion, is to quit Outlook and begin using a web-based email client. If you’re checking your mail on more than one computer, this is considerably easier, and you just don’t have to think about syncing because your client is on the Internet, not on the computer.