ICQ
AIM
Mail.Ru Agent
Gadu-Gadu
QQ
Jabber (LiveJournal Talk, QIP, Ya.Online, Facebook Chat)
Google Talk/GMail/Google Chat/Orkut
MSN/Windows Live! Messenger
Yahoo! Messenger
Facebook Chat
MySpace IM
VK.com (vkontakte.ru)
Xfire
Internet Relay Chat (IRC)
Twitter
SIP
WinPopup

PIM, reminders and sticky notes
manual contact adding
Anti-Boss
notifications about contacts who has returned after an absence of long period, first time online and beeng long time offline
shutdown scheduler
quotes and currency converter
whiteboard (works with Miranda IM Ultimate users only)
HDD information viewer
weather forecasts (wetter, The Weather, Channel, Underground weather)
"MeBeam" - web-based video chat with any online contact using any network
protocol associations (link handling)
authorization control
flash avatar display
funny games (GoMoKu, "Battleship", chess, checkers, Durak, OSCAR fight, KexX and others)
easy-to-use configuration menu
beautiful contact list with icons. statuses and buttons
sending/receiving contacts (depend on protocol and client)
secured messaging
automatic profile backup
profile password protection
automatic idle
beautiful sounds
3 ways to send file (direct, FTP and as text messages)
buddy client showing
floating contacts
E-Mail notifications and sending
easy fast and feature complete history viewer
invisible detecting in ICQ and Google Talk
tZers/ZAPs/Mults
websites, pictures and YouTube videos preview in dialog window
importing history from other profile or Mirablis ICQ
flashing keyboard LEDs when a message has arrived
magnetic windows
easy context menu
metacontacts
audio/video chat (work only if your buddy use Miranda IM Ultimate too)
social networks notifications (Facebook, MySpace IM, VK.com, Twitter)
autoreply
showing popup when your buddy changes his status or X-status
nudges
easy-to-use profile manager
beautiful and informative popups
quick contact search (Alt+Q)
RSS news reader
screenshots capturing and sending
context menu integration
beautiful emoticons - over 230 ones (depend on protocol)
SMS sending (using ICQ and Mail.Ru Agent protocols)
spell checker
anti-spam bot
crash dumper
advanced profile (database) editor for power users
beautiful and informative tabbed dialog window
informative tooltips
automatic updates (partly)
advanced music features: player control buttons and last.fm scrobbler
birthday reminder
advanced features for gamers (only if Xfire protocol is installed)
Internet radio
Skype integration (status synchronization)
fully portable