GW7 to Exchange2007 w/Co-Existence (Exchange 2003 in the middle)

[tmm]

I have done they same thing. Exchange is very nasty with internet addressing.
We have setup an dummy internet address space for exchange. It does no matter, when exhange have the same internet address like the gwise user. gwise gwia does not recognize them.
if you migrate a single user to exchange, (it don't disapper in gwise) you have to chnage the internet address in gwise, then you cna give the "external" user from the exchnage postoffice the internet address
thomas
you have to do it for every user manualy