Up until last week I was receiving my emails from my Yahoo account with no problems to my BB. Suddenly I stopped receiving new mail. I tried removing the email from my phone and reloading it and I get a message that says "email address or password is invalid" which it is not of course. I have spent countless hours on the phone with Sprint technical support and with blackberry support with no luck. Any ideas?

I assume that you have tried a battery pull and that didn't help?

Log into your Yahoo account on a PC to make sure the password still works. Then log into BIS and resend the service books.