Hi everyone,
I'm a beginner in this stuff .. I just got a blackberry storm, registered on it with a yahoo mail, and I can send emails now. But, I found that only the emails which comes into my inbox are forwarded to the device (i.e. If a mail is moved to a folder using any filter, that mail isn't forwarded to my device) ... How can I solve this, thx in advance

Wrong place to post.

You cant.
BIS (the thing you registered that email address with) only polls and pushes email from the inbox. NOT folders.
you'll have to remove the filters for it to work.

You could try LogicMail. It won't push the mail to you, but you should be able to use it to look into folders.