I have a single exchange 2003 (native mode) site, with two servers in a mixed mode windows 2003 domain. everything works well except -- I have a large mail enabled security group, which works perfectly well for security puposes but only a few users can see the members of the group for mail puposes. any ideas. happy to provide more detail if neccesary but I am not sure where to look. I checked for global catalog problems and there doesn't seem to be any.