As I mentioned in my last clustering post, there are some Exchange problems we’ve been working on over the past few weeks.  One of the simpler problems has a complex answer, so I thought I’d explain a bit.

As any good Exchange administrator knows, Exchange stores its data (for a store) in 2 files, the EDB file, and the STM file.  However, there’s not a really great explanation of the differences between the two files – the best I’ve found so far is at, but they only explain that the STM is MIME formatted, and the EDB is MAPI content. Why, though, and how does it affect the end users? This is what we’ll explore. (more…)