IBM announced last night that it is selling the final components from its 1995 acquisition of Lotus to Indian firm HCL for $1.8 billion.

IBM paid $3.5 billion for Lotus back in the day. The big pieces here are Lotus Notes, Domino and Portal. These were a big part of IBM’s enterprise business for a long time, but last year Big Blue began to pull away, selling the development part to HCL, while maintaining control of sales and marketing.

This announcement marks the end of the line for IBM involvement. With the development of the platform out of its control, and in need of cash after spending $34 billion for Red Hat, perhaps IBM simply decided it no longer made sense to keep any part of this in-house.

As for HCL, it sees an opportunity to continue to build the Notes/Domino business, and it’s seizing it with this purchase. “The large-scale deployments of these products provide us with a great opportunity to reach and serve thousands of global enterprises across a wide range of industries and markets,” C Vijayakumar, president and CEO at HCL Technologies, said in a statement announcing the deal.

Alan Lepofsky, an analyst at Constellation Research who keeps close watch on the enterprise collaboration space, says the sale could represent a fresh start for software that IBM hasn’t really been paying close attention to for some time. “HCL is far more interested in Notes/Domino than IBM has been for a decade. They are investing heavily, trying to rejuvenate the brand,” Lepofsky told TechCrunch.

While this software may feel long in the tooth, Notes and Domino are still in use in many corners of the enterprise, and this is especially true in EMEA (Europe, Middle East and Africa) and AP (Asia Pacific), Lepofsky said.

He added that IBM appears to be completely exiting the collaboration space with this sale. “It appears that IBM is done with collaboration, out of the game,” he said.

This move makes sense for IBM, which is moving in a different direction as it develops its cloud business. The Red Hat acquisition in October, in particular, shows that the company wants to embrace private and hybrid cloud deployments, and older software like Lotus Notes and Domino don’t really play a role in that world.

The deal, which is subject to regulatory approval processes, is expected to close in the middle of next year.