1. AIX：
AIX是IBM提供的一系列专有操作系统。 AIX代表Advanced Interactive eXecutive。最初，它是为IBM RT PC RISC工作站设计的，后来又用于各种硬件平台，例如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 Network Server。它是五个具有The Open Group的UNIX 03标准认证的商业操作系统之一。 AIX的第一个版本于1986年发布。AIX的最新稳定版本是7.2。
2. OS / 2：
OS / 2是由Microsoft Incorporation和IBM协调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。它使用C，C++和汇编语言编写。 OS / 2的第一个版本于1987年发布。它于2006年停产，此后以eComStation的名称进行更新，维护和销售。在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之间的区别：
| 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. |