are you using BES or BIS service. BIS you need email address,password, username, mailbox name, domain, and exchange URL. If is BES need activation password for BES and then enter email address and password in enterprise activation
On BIS, to get your email from work, you need to log into your BIS page via computer and add the email account. You'll need your username and password for that account, plus the incoming email server from work. Something like "incoming.companyname.com. Once you set that up on the BIS page the mail should flow.
If you're on BES from your company then the IT guys have to set it up for you.
You could also set up a rule in Outlook at work to forward all your mail to your regular email account. Something like [email protected], or whatever your Blackberry email address is. It's not optimal and won't allow you to respond to work emails through your work account, but you'll get them. They also won't sync/reconcile with your Blackberry so if you respond to one you won't have that response at work, nor will the emails in your inbox at work appear read.