You cannot have one device connected to two different BES servers. Each device is connected to one mailbox on one server, that's the way it works.
If your company allows IMAP connections to mailboxes you should be able to set up a second mailbox using a BIS account however, you won't get things like calendar/contacts, but you can at least get the email.
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Blackberry Admin
BES 5.0.2 MR4
Exchange 2010 SP1 RU2
Blackberry 9630
WES 2008 Alumni
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