The messaging and groupware landscape has altered significantly in the last few years with, like it or loathe it, Microsoft’s Exchange Server now firmly ensconced as the number one solution regardless of customer size or industry sector. There are alternatives, of course, but rival developers have more or less given up on trying to beat Microsoft at (what’s now) it’s own game. Instead most now concentrate their efforts on developing alternative messaging and collaboration servers which to end users, and their applications, look and behave just like the Exchange they’re hoping to replace