The Register
says to this:
Quote:
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Usage of either IM client will be conditional on the backing of the networks, as will pricing. AIM will only be available through "AOL authorised" networks, for example; RIM and Yahoo! said they would both work to help carriers bring YM services to customers. YM will be pre-installed on Blackberry devices "in the coming months", RIM said.
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Still not a definite answer, but it sounds to me as if they are not planning to offer an upgrade to existing devices.