Before you gang up on me and tell me I've posted in the wrong spot, how stupid can I be, etc.... I did read the definition for service book but as a relatively new blackberry user, what if anything is the service book actually used for? I've seen it mentioned several times now but still don't quite have a clue on what exactly it is. I know where to find it and everything but that's about it.

It's a piece of software code that gets placed on your BlackBerry device to enable certain features, or provide certain functionality.

For example, an MMS service book would be put on your device to allow your device to send/receive MMS message.
There's service books for numerous things... such as email, calendar, browser, IM, etc.

Hi

Each service book is a setting for your device. One service book will be for your email, one for instant messaging and one for the browser and so on.

Hope that helps

Our FAQ is an amazing thing to waste:
BlackBerry Glossary - BlackBerryFAQ

...this is where i looked originally BEFORE i posted my question... but thanks to everyone else for giving me a better description.

cool... Wanna write a cleaner definition for the FAQ, I'll edit and add it.

thanks for answering i was wondering that myself

is it possible to edit a service book, for example to try and get MSN to work on AT&T?

Sure you can edit Service Book to make it work as you wish by using IPD Editor and WinHex