Yahoo has launched a web-based version of its free instant messaging (IM) service for internet users.

Yahoo Messenger for the Web can be used from any Internet-linked computer without needing to download or install software, as was the case previously.

By dispensing with the need to install and run a separate IM programme, Yahoo intends to reach out to consumers around the world who use the Web in Internet cafes instead of personal computers at work or at home.

The move also appeals to travellers, business professionals on the go and office workers whose companies block IM software downloads on their internal networks for security reasons.

Yahoo’s new Web-based IM service offers an archive feature that allows a user to search back to find all previous conversations with any of their IM contacts. Another feature likely to impress users is the ability to manage 10 or more simultaneous conversations in just one IM window.

The Yahoo service is initially available in Brazil, India, Malaysia, Philippines, the United States and Vietnam and will gradually expand to additional countries.