1)   FTGate 4.5
FTGate4 is a powerful Windows mail server with comprehensive Groupware functionality. Features include calendaring, contacts, IMAP, anti-spam , anti-virus support, multiple domains, Web Administration, WebMail, instant messaging, SPF,SSL + more.
Mail Server, Groupware, POP3, SMTP, IMAP, Shared Calendars, Shared Address Books, Shared Contacts, Anti-Virus, Anti-Spam,

 2)   OLfolders PE 2.5.2
Share Microsoft Outlook in a network without installing a complex server application. OLfolders PE enables sharing personal data files with 5 users in a network. It runs under any version of Windows from 95 to 2003 Server and Outlook from 97 up to XP
Sharing outlook, Outlook Groupware, Share outlook, WorkGroupFolders, Outlook team, Personal edition, Small business network, Team edition, Small office network, Shared emails,

 3)   OLfolders 2.6
Small office networks - Microsoft Outlook plus Windows XP Service Pack 2 - With OLfolders you install secure and reliable Outlook networks in small and medium sized (SME) and large enterprises.
Outlook Groupware, WorkGroup folders, Outlook Workgroup, Outlook-Network, Office Networking, Outlook add, Personal folders, Public folders, Sharing pst, Shared contacts,