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.
Microsoft receives a 30 per cent cut of all purchases on the Xbox digital store
Credit card thieves used Apple ID accounts to buy and sell virtual currency for Clash of Clans and Clash Royale and Marvel Contest of Champions
$5.1bn fine further evidence that the EU is anti-US, claims Trump
New cable will connect Virginia to France