AOL Instant Messenger
W98/ME/NT4/2000/XP
Free
URL: aol.co.uk/aim
This program carries a large advert square in its "who is online" box, unless you are using it as part of AOL's proprietory internet access software.
You can sign up for this Messenger with your existing email address - you will be asked to select an aol user name not already in use.
Requires MS Internet Explorer 5.0 or later to be installed on your system.
MSN Messenger
W98SE/ME/NT4SP6/2000SP2/XP
Free
URL: messenger.msn.co.uk
Windows XP comes with Windows Messenger as standard, which is a cut down version of MSN Messenger, connecting to and providing the same basic communications service. MSN Messenger has additional features, aligned to MSN's other services.
You can sign up for these Microsoft Messengers with your existing email address - you do not need to sign up for their hotmail system simply to use the messenger.
Avatars and additional smilies are available, but both at a cost. The tabs that run down the left hand side of the "who is online" box can be hidden by indicating that you are using a shared computer via the security preference setting. The box carrying a small advert bar at the bottom cannot be hidden and does make this messenger's slick appearance begin to look more cluttered than the Windows Messenger alternative.
XP users can upgrade to the rebranded Windows Live Messenger, which takes the software effectively to version 8.
Yahoo! Messenger
W9x/ME/NT/2000/XP
Free
URL: uk.messenger.yahoo.com
Yahoo's service comes with free avatars, a raft of smilies and no advertising in the main "who is online" box. It also comes with ready access to Yahoo's free Launch radio services, but this can be hidden easily with either a minimise button, or via unticking a box in the preferences menu option.
Yahoo's Messenger also comes linked to BT's internet to landline phone service, which can be used through the Messenger software. It offers a number of functions that the others do not, including offline messenging of contacts. You are asked to create a free Yahoo account which will come with a web-based Yahoo email account.
Requires MS Internet Explorer 5.01 or later to be installed on your system, but also supports Mozilla Firefox if that is set as your default Internet browser.
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