I have an 8700 and would like to buy a Pearl. I'd like to keep both activated with the same work e-mail address, and use the Pearl as my main phone and "weekend" Blackberry, while using the 8700 for more serious work during the week. Is there any way I can do this? We have a BES using Microsoft Exchange. Thanks.

Nope, not on BES, unless you switch devices on the weekends which will become tedious - one BES device to one Exchange mailbox.

As noted, you can't set two devices up to the same email account with one BES server.

That said, if the Pearl is more for convenience, you could set it up to use Outlook Web Access (if your company has that implemented) through BIS (if your company allows it), or forward your Exchange email to your blackberry.net email address (if your company doesn't have restrictions on automatic forwarding outside its domain).

Just an FYI - I doubt there's any restrictions on having both BB's syncing to BIS email accounts - that is both devices monitoring your Yahoo email.