Chris,
There are 2 servers required for an email client such as Outlook.
One is to pick up messages FROM - e.g. POP3.ispname.com and one is to SEND messages TO - e.g. SMTP.ispname.com.
Of course, there may be only one physical server, but it will have 2 names like above.
You will need to find out from your provider what the correct server names are to send and receive messages.
You may also need to provide credentials (username and password) to send and receive messages - these can usually be stored in Outlook so you don't have to enter them each time (but makes it very likely you will forget them).
If you wish to receive messages from from than one mailbox, you can do this in one of 2 ways, either by setting up 2 seperate IDENTITIES in OE, each mapped to a single mailbox, or by mapping both mailboxes to a single identity, so that all messages come into a single location.
If choosing the latter route, you need to be careful with outbound messages - I suggest that you only have one outbound server (SMTP server) configured.
It is easy to set up and switch between identities - File/Identities in OE.
HTH
SD
So, each Windows account can have multiple OE Identities, and each Identity can have multiple mail servers (inbound / outbound).
Bear in mind that a POP3 client will pull all messages stored on the mail server down to the local PC and the server copy will be deleted. So if you want to keep copies on the server (visible when you connect to the server from a different PC) you will have to ensure that you use an IMAP client.