This is why I use GMAIL as a main email address and also install the GMAIL client on my Blackberry.
Then, if an older message isn't on my Blackberry, I can open up the GMAIL client and search for it really quick there.
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Blackberry Storm2 (Verizon)
7280-7780-7290-7100g-7250-8703-8830-8330-9530-9550
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