The messenger add-on era: multi-login loaders, patches and the end of Yahoo! Messenger

History · Published 2026-09-05

Close-up of the keypad of an old mobile phone in blue-green light — The keypad of a 2000s mobile phone.

In the early 2000s, a whole ecosystem of small, free programs grew up around the big instant-messaging clients. Most of them are gone, along with the networks they were built for. This is a brief history.

This address once belonged to the download page of a messenger add-on published by ShiftThis around 2004. That software is not available here, and we do not distribute old messenger tools of any kind: the networks they connected to no longer exist, and old executables circulating online are a common way of spreading malware.

The networks

Around 2004, personal instant messaging was split between several incompatible networks, each with its own official client:

AOL Instant Messenger (AIM), launched by AOL in 1997, dominant in the United States.
Yahoo! Messenger, which started in 1998 as Yahoo! Pager and was strong among users of Yahoo's mail and chat rooms.
MSN Messenger, launched by Microsoft in 1999 and renamed Windows Live Messenger in the mid-2000s, widespread in Europe and Latin America.
ICQ, the oldest of the four (1996), still popular in parts of Europe and Russia.

None of the official clients could talk to the others. Each was also distributed free and funded by advertising, which shaped what users wanted to change about them.

What the add-ons did

Independent developers, many of them teenagers or hobbyists, published small utilities that changed how these clients behaved. Sites like this domain catalogued and released them, alongside news about the networks. The main families were:

Multi-login loaders

The official Yahoo! Messenger and MSN Messenger clients of the time allowed one signed-in account per computer session. People with several accounts (one for friends, one for work, one for chat rooms) wanted to run them side by side. "Multi" loaders and patches, sometimes nicknamed "polygamy" patches, worked around the check that prevented a second copy of the program from starting. Because the check changed with each new client version, the loaders had to be updated after nearly every release, which is why so many release announcements carried version numbers matching the client's.

Ad removal and interface patches

Patches removed banner ads, enlarged or resized windows, restored menus that a new version had moved, or changed skins. Some edited the client's resource files; others modified the executable directly.

Status and integration tools

Other utilities displayed the song playing in Winamp or Windows Media Player as a status message, exported or read chat archives, showed online status on web pages, or managed contact lists. Several of these later became official features of the clients themselves.

Bots and scripts

Outside the big four networks, IRC users ran bots and scripts to manage channels, and some add-on sites also covered those communities.

Why that ecosystem faded

Several forces ended it in the second half of the decade:

Multi-protocol clients. Programs such as Trillian (Cerulean Studios) and Gaim, renamed Pidgin in 2007, connected to several networks from one window and supported multiple accounts natively, removing the need for loaders.
Official features. The clients gradually added what the add-ons had provided, from personal status messages to "now playing" integration.
Security. Patched executables and unofficial downloads were a natural vehicle for malware, and messenger networks themselves became targets for worms that spread through contact lists. Users and providers grew warier of modified clients.
The move to social networks and phones. Facebook chat, then smartphone messaging apps, drew users away from desktop messengers.

The end of the networks

Service	What happened
MSN / Windows Live Messenger	Microsoft retired it in 2013 in favour of Skype, moving users over; the service continued in mainland China until 2014.
AIM	AOL shut the service down on 15 December 2017.
Yahoo! Messenger	Yahoo announced in June 2018 that the service would close, and shut it down on 17 July 2018, giving users a period to download their chat history.
Google Talk	Google replaced it with Hangouts from 2013 and ended the remaining Google Talk service in 2017.
ICQ	Its owner, VK, closed ICQ on 26 June 2024.

Encyclopaedia entries for Yahoo! Messenger, AIM, Windows Live Messenger and ICQ give fuller timelines with references to the original announcements.

With the servers gone, the old clients cannot sign in, and neither can any loader or patch built for them. Old installers found on download sites today serve no purpose and carry real risk.

Doing the same things today

The needs that drove the add-ons have not disappeared, but they are met inside current apps:

Several accounts at once: Telegram, Discord and Slack let you switch between accounts or workspaces in the same app; browsers offer separate profiles for web-based messengers.
One window for many networks: Pidgin still exists for open protocols such as XMPP and IRC; the open Matrix network can bridge to other services.
Your old chat history: if you saved Yahoo! Messenger or MSN archives before the shutdowns, they are files on your disk; without the original client, text-based exports are the easiest to read.

From messenger add-ons to WordPress

Like many hobbyist download sites of the period, the site that once lived on this domain moved on from messenger tools to web software, in its case WordPress plugins. Plain Hooks now covers that second subject with independent guides. Start with the help hub.

The WordPress side of that story, from the plugin hooks of 2004 to automatic updates, is told in how WordPress plugins began.