oa程序 ，包括工作流审批 、组织机构的建立、企业内部邮箱、通讯录管理、会议管理等功能-oa program, including workflow approval, establish organizations, internal mail, address book management, meeting management, and other functions

基于CentOS6.5以上的邮箱服务器开源软件，安装方便，企业可以有自己的邮箱了（下载完，自己在文件后缀加上.bz2，之后再解压）(Based on CentOS6.5, the open source software of mailbox server is easy to install, and enterprises can have their own mailboxes.)

Open62541是OPC基金会的开源动态库，免去了需要企业邮箱才能注册下载的麻烦。(Open62541 is the open source dynamic library of the OPC foundation, which eliminates the need for enterprise mail to register and download.)