. . at least a year ago, but I'm not sure. I dealt with 3.0 for only a few months before moving (myself and clients) to 4.0, and haven't watched it closely. WarpServer 3.0 is still supported (and supports the Warp 4 desktop).
I understand they've told the banks support for 4.0 will end in 2006, but they may have to back off because the bank transition from OS/2 to Linux isn't going well. Many banks are opting for Windows instead because ATM makers are going to Windows. NCR is already Windows, but Dibold is still on OS/2 and doesn't know when they might change.
Of course eComStation (Serenity) has a charter to continue OS/2 devlopment.