Hi, I've got an IMAP account which I view my email inbox on my bberry. However I can't see messages which come into my spam folder. When I viewe the folder it is blank. Any ideas please?

That folder is not set to sync. You can try to change that, but it may not work as you intend. BlackBerry devices are meant to sync inboxes.

OK thx. How can I try to get this to work?

You'll need to open the folder in the mail application and then see if there is an option to set it to sync. There most likely won't be.