@Sukesh: What version of Evolution are you running?
If this is working fine under Fedora, that suggests that Fedora is
shipping a newer version of Evolution than Ubuntu 11.10 which connects
to Exchange 2007 server. In other words, the fix would have been made
upstream, and Ubuntu 12.04 will likely offer the updated Evolution
packages.
@Sukesh: What version of Evolution are you running?
If this is working fine under Fedora, that suggests that Fedora is
shipping a newer version of Evolution than Ubuntu 11.10 which connects
to Exchange 2007 server. In other words, the fix would have been made
upstream, and Ubuntu 12.04 will likely offer the updated Evolution
packages.