Thought I'd post this from the Knowledge Base at blackberry.com:
http://www.blackberry.com/knowledgec...20306&vernum=0
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Description
This article describes the new features available after upgrading to BlackBerry Internet Service 2.0.
Multiple Service Books
Each integrated email account uses its own service book on the BlackBerry® wireless device. This allows you to send messages from multiple email addresses.
Save Sent Items
For Microsoft® Outlook® Web Access, Yahoo!® and BlackBerry Mail Connector integrations, a copy of messages sent from the BlackBerry device will be placed in the source Sent Items folder. For example, if you send a message from your device using your Yahoo account, you will see a copy of the sent message in the Sent Items folder in your Yahoo account.
Wireless Read/Unread Status
Messages marked as Read or Unread on the device will also be marked as Read or Unread in the mailbox of an integrated account. However, this does not apply to post office protocol (POP) integrations.
Wireless Deletion
Messages deleted from the device can also be deleted from the mailbox of an integrated account. When deleting a message, you will prompted to select whether or not to delete the message from the original mailbox.
Yahoo Messages
When you have an integrated Yahoo account, messages from this account will be delivered immediately.
Outlook Web Access Support
Integration of Microsoft Outlook Web Access 2003 is now supported by the BlackBerry Internet Service.
Filters
Message filters can be set up on each individual integrated account.