I'm looking for a better solutions for just simple full blown email solution with LDAP integration and MS outlook syncing of emails,contacts,etc. I'm planning to deploy only community version since this is just a simple mail collaboration that can also handle 500 users/mailbox.

I seen many opensource solution but my eye still coming up to zimbra because its all in one, roundcube is the second but it just offered webmail solution. I'm wandering what was more qualified for just our requirements?

- 500 users/mailbox
- Sync to MS outlook email, calendars,contact, in case of workstation failure that will save to server itself(I've seen z-push and funabambol)
- LDAP integration

You're help guys will benefit my our company