I am currently using my work's POP server with TMO's BIS and a Blackberry 8100, but they do have an exchange server. How difficult will it be for me to set up your service with their exchange server(5.5 / so sad)? I will also want to use my personal Gmail account. Will I be able to view shared calendars OTA with this product? Will I need to get BES with TMO? If not, would there be any advantage to getting it? I am a network engineer with my company so feel free to give me a technical response. Thanks.