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Internet Information Services (IIS) - previously called Internet Information Server - is software web server with a collection of extension modules. It is created by Microsoft for the operating system MS Windows. It is the most used web server after Apache. IIS 7.5 supports HTTP, HTTPS, FTP, FTPS, SMTP and NNTP protocols.
IMAP (Internet Message Access Protocol) is web protocol for remote access to a mailbox via the email client. IMAP allows you to use advanced options for the remote administration (working with folders and transferring of messages among them, searching on the server side, etc.) and work in online and offline mode. These functions are not supported by the older and simpler POP3 protocol.