ICQ specifications

Communications: Chat; Dial-up Software; E-mail Software; E-mail Utilities; SMS Tools; Spam Filters; Web Phones & VoIP Software; Webcam Software

Improvements since version 3.2

Interoperability with AIM and iChat instant messengers. You can add users from those messengers to your Contact List and exchange instant messages with them.
Better peer to peer connectivity: MacICQ now supports passive p2p connections for users behind firewalls.
Users behind firewalls can now choose their listen port range.
Auto-reconnect (available in the Connection panel of the Network and Security window). Users with a permanent internet connection should turn this on to avoid occasional disconnect messages.
Easy way to enter active URLs directly into outgoing messages.
New support for unicode text entry (e.g., for Arabic and Hebrew)
Cosmetic issue: Incoming SMS messages are now displayed (as opposed to not displayed in the previous version, a feature which some of you did not appreciate).
The Contact List can now display names in multiple languages.
URLs are read from Safari.
Clickable URLs in message windows.
Many bug fixes