The free program targets business users by offering integration with Microsoft Outlook and one-click access to the WebEx Communications online conferencing tool. It also has enhanced security features.
Around 135 million workers worldwide use instant messaging services, according to market research firm The Radicati Group.
AOL claims that about 14 million subscribers of the consumer-oriented AIM application use the tool for business.
Internet measuring firm ComScore Media Metrics puts the worldwide number of instant messaging users at 339 million.
The AIM Pro launch illustrates the increased level of competition in the enterprise instant messaging space.
Enterprises have had a rocky relationship with instant messaging. Users often install the applications without the IT department's authorisation, subjecting businesses to potential security and data retention issues.
New regulation expected to cut greenhouse gas emissions by about 17 million metric tonnes between 2020 and 2050
Molybdenum ditelluride is a two-dimensional material that can be easily stacked into multiple layers to create a memory cell
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Optical traps are scientific instruments in which a focused laser beam is used to exert an attractive or repulsive force on a microscopic object to hold it in place
Scientists estimate that the exoplanet has already lost up to 35 per cent of its mass over its lifetime