Microsoft is releasing to manufacturing not only Exchange Server 2003 today, but also its Real Time Communications Server, code-named "Greenwich," according to early reports. Microsoft also is said to have released Windows Messenger 5.0 — one of the clients for RTC Server — to manufacturing as well. But, as we reported late Friday, we are hearing that Microsoft is waiting until October to officially unveil the entire "Office System 2003" family, of which Exchange Server 2003 and RTC Server 2003 are supporting members.