I am on vodafone in the UK but with a BES and have used 3 different IM programs successfully on my blackberry (7230 and 7290) I am using MDS so effectively my BES is a proxy server and it will allow anything the firewall at the office allows, I am sure I heard that with a "mobile email" blackberry the services that vodafone allow on the handheld are limited to web browsing and email transfer.
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