You need to change your login in Account Config (or whatever it's called, I don't have outlook express here).
You will probably find you are logging in to the email account as 'blah' (as in blah.co.uk) but you need to be logging in as 'sales%blah' or 'sales@blah' with the specific password you set up for each mailbox.
Your host should really be the one you talk to about this problem.
Everyone else is right on the button about changing your email client. I find Thunderbird invaluable and its interface is similar in function to OE, making the transition quite painless. It will import all your settings from OE as well (it is a very easy install).
The upcoming Office 2007 would be worth a look if you want to spend some pennies. The new version of Outlook is pretty awesome. A bit bloated because of the built-in calendar and such, but it really is the Rolls Royce of email clients.
You will probably find you are logging in to the email account as 'blah' (as in blah.co.uk) but you need to be logging in as 'sales%blah' or 'sales@blah' with the specific password you set up for each mailbox.
Your host should really be the one you talk to about this problem.
Everyone else is right on the button about changing your email client. I find Thunderbird invaluable and its interface is similar in function to OE, making the transition quite painless. It will import all your settings from OE as well (it is a very easy install).
The upcoming Office 2007 would be worth a look if you want to spend some pennies. The new version of Outlook is pretty awesome. A bit bloated because of the built-in calendar and such, but it really is the Rolls Royce of email clients.