... Or Take Out
Although there are companies that host BlackBerry Enterprise Server and Exchange seats, the main alternative to the behind-the-firewall model is a wireless e-mail service hosted by a cellular operator.
Most cellular operators offer wireless e-mail in partnership with a third-party provider. The leaders are Seven Networks (which recently acquired Smartner) and Visto. In this case, the operator hosts the e-mail gateway, and you configure it to access the e-mail servers residing on your network. This approach will yield most of the functions listed above, with the notable exceptions of over-the-air provisioning/updating, over-the-air security management and access to other corporate information. Also, you won't have a huge amount of choice, as most operators work with only a few wireless e-mail service partners.
On the plus side, for small deployments, outsourcing gets you up and running quickly and may be all you need. But any company serious about control, management and security will be better served with a wireless e-mail gateway installed behind the firewall.
Messages at the Gate
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