1. 艾克斯：
AIX 是 IBM 提供的一系列专有操作系统。 AIX 代表高级交互式执行程序。最初它是为 IBM RT PC RISC 工作站设计的，后来它被用于各种硬件平台，如 IBM RS/6000 系列、基于 PowerPC 的系统、System-370 大型机、PS-2 个人计算机和 Apple 网络服务器。它是通过 The Open Group 的 UNIX 03 标准认证的五个商业操作系统之一。 AIX 的第一个版本于 1986 年推出。AIX 的最新稳定版本是 7.2。
2. 操作系统/2：
OS/2 是微软公司和IBM 合作开发的一系列操作系统。它的目标系统是个人计算机和服务器。它是使用 C、C++ 和汇编语言编写的。 OS/2 的第一个版本于 1987 年推出。它于 2006 年停产，之后以 eComStation 的名称进行更新、维护和销售。 2015 年，它被命名为 ArcaOS。此操作系统中使用的内核是带有模块的 Monolithic。
AIX 和 OS/2 的区别：
| AIX | OS/2 |
|---|---|
| It was developed and is owned by IBM. | It was developed by co-ordination of Microsoft Inc. and IBM. |
| It was launched in 1986. | It was launched in 1987. |
| Its target system type is Server, NAS and workstation. | Its target system types are personal computers and servers. |
| Computer architectures supported are POWER, PowerPC-AS, PowerPC and Power ISA. | Computer architectures supported by OS/2 are 16-bit x86 (1.x only) and IA-32. |
| Kernel type is Monolithic with modules. | Its kernel type is Monolithic with modules. |
| The native APIs are SysV/POSIX. | Its native APIs are Proprietary, DOS API and Win16. |
| Preferred license is Proprietary. | It has the preferred license of Proprietary. |
| The non-native APIs supported through its subsystems are DOS API. | The non-native APIs supported through its subsystems are Win32. |
| File systems supported are JFS, JFS2, ISO 9660, UDF, NFS, SMBFS and GPFS. | File systems supported by OS/2 are HPFS, JFS, FAT, ISO 9660, UDF and NFS. |