You probably have to dig into the dpm database to remove some old links/informations, this is a bit more complex and i would suggest you check directly with microsoft about this. No limits in having mutiple activesync devices though and it will play. If the device get's lost or breaks you need to remove the device in the blackberry manager and do a aditional enterprise activation.
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Introduction the marketing in a box (mib) app marketing resource offering from nokia provides marketing guidance and free marketing asset generation tools to help developers market their apps.