If you’re in one of the few companies that allow iPhones for enterprise use and haven’t got around to updating to version 3.1 of the iPhone released earlier this week, you might want to double-check with your IT guy before taking the plunge. Apparently, Exchange policies properly recognize the new OS and enforces e-mail encryption that older devices might not be able to support. The iPhone 3GS handles the new security measures fine, but anyone packing the original iPhone or the 3G may be without work e-mail as a result of updating to 3.1. Sure, it sounds like a bug to be squashed, but this is good news for enterprises who had been previously unimpressed with the iPhone’s security standards. Has anyone experienced a screen like the one above?