ICQ was an Internet messaging service built around an account identifier, contact list, presence status, and direct conversations. The desktop and mobile clients connected to ICQ’s servers to locate contacts and exchange messages; they were not independent local chat programs that could keep operating after those servers disappeared. The official ICQ site now states that the service has stopped working and points people toward VK Messenger for personal chats or VK WorkSpace for workplace communication.
The network is gone
An old ICQ installer may still open, display cached settings, or ask for credentials. None of those screens proves that the service remains available. Account sign-in, contact presence, message delivery, and account recovery depended on publisher-controlled endpoints. Installing another archived build does not recreate that network.
This distinction matters when a download page still lists the former client. The file is historical material, not a route into a functioning ICQ account. Repeated password attempts can also expose an old password to an untrusted repackaged installer without producing a connection.
UIN was the identity
ICQ historically assigned each account a numeric Universal Internet Number, usually called a UIN. Contacts could use that number to identify the account even when the visible nickname changed. A UIN was an account address, not a backup of the user’s messages or files.
Someone who remembers a UIN but lacks access to the retired service cannot use the number as a standalone chat destination. The publisher’s shutdown also means that old account-recovery instructions no longer promise a working result. A third-party page that asks for the UIN and password should not be treated as an official continuation merely because it recognizes the old field names.
Archives stayed local
Some ICQ clients kept conversation history and received files on the computer. Those local records belonged to the client profile and storage path rather than to the UIN itself. Reinstalling Windows or moving to another computer could therefore separate the account identity from its old archive.
A person preserving historical messages should work on a copy of the old profile before launching cleanup or import utilities. File formats changed across client generations, and a current text editor may not interpret the archive directly. Uploading the only copy to an unknown converter creates another privacy risk because private conversations leave the computer.
Migration is manual
The official replacement notice names VK services, but it does not state that an ICQ contact list or message archive moves automatically. A new VK account has its own identity and contact system. People need to reconnect there through a current address or invitation.
The same limitation applies to work groups. Moving a team to VK WorkSpace means creating or joining the appropriate workspace and establishing its membership. An old ICQ group name does not become a live workspace by installing another client.
Old files need caution
Archived installers can preserve the interface for research or help recover a local profile, but they no longer receive normal maintenance. Their age may also conflict with current operating-system security and certificate rules. Compatibility mode can change how the executable starts; it cannot repair the closed service.
ICQ should therefore be understood as a discontinued network, not a current messenger with a temporary login fault. The official stop notice is the decisive state. A working modern conversation requires a supported service and a new contact path, while any remaining ICQ data needs separate local preservation.
