Thanks for all the replies. Seems like this is one of those "close but not quite there yet" areas. but we may be lucky.
The Exchange functionality we will need includes calendar sharing and ideally resource booking. I'm going to start by look at scalix and zimbra. I'll set them up within a virtual network and see how I get on. Also on my list are citadel, postpath, open exchange and sme server (the latter is more a server os replacement, but in for a penny, in for a pound, eh?) Will let you know how i get on. Kerry.
