After abandoning plans for a future Microsoft Exchange Server version, code-named Titanium, that would have replaced Exchange's Jet data store with a next-generation data storage engine that uses Microsoft SQL Server technology, Microsoft decided to refocus. Rather than follow a purely technical path for the next Exchange version, the company is addressing customers' key pain points and upcoming business trends. The result, code-named E12 (for Exchange 12), will be one of the most impressive upgrades to Exchange that Microsoft has ever released. Here's what you need to know about E12.(continue at source)