[BadWolf]

Do I have to ring my network carrier, or can I set it up manually?

UK / O2 by the way...

[ricpac]

If it's been working before then it should still work.

[JSanders]

Simply set it up manually IF the settings did not transfer over from your previous OS, and it should have.
How to add / delete email addresses - BlackBerryFAQ

[BadWolf]

It wasn't set up automatically. However, I re-sent the service books from my service providers web back end (o2email.co.uk), and now all works fine, thanks!