Hi,

I've been asked to build a outlook add-in that processes incoming and outgoing email and supports outlook 2003 up to 2010.
1. Is it possible to build a single add-in for all outlook versions?
2. In both cases, where would I start?
3. I've been looking at the outlook interop (v14.0), but doesn't that assembly only apply to outlook 2010?

Thanks for any pointers