Middle names are not supported in Netscape, so managing users with the same first and last name is very confusing. Usernames would solve this problem, too. This is a nice feature. Resource calendars for rooms and equipment are a necessity. A search feature would be nice.
Migration is always a nightmare.
Integrated migration tools from Netscape Calendar would be nice. Permissions on individual calendar entries is a nice feature. Manually creating accounts is a drag. Some mature administration tools are needed, including the ability to integrate with our password synchronization system and including some way to manage accounts from a command-line. We use the Amplitude EventCenter for our University Calendar.