IIS
IMAP
IMAP4
ISAPI Filter
IIS is Microsoft’s business-class Web server. Although Apache boasts more total worldwide installations than IIS, many corporations choose IIS as their Web server because it is supported by a commercial organization. Some have criticized IIS in the past, though, for its alleged security weaknesses.
IMAP
Short for Internet Message Access Protocol, a protocol for retrieving e-mail messages. The latest version, IMAP4, is similar to POP3 but supports some additional features. For example, with IMAP4, you can search through your e-mail messages for keywords while the messages are still on mail server. You can then choose which messages to download to your machine.
IMAP4
IMAP4 is a mail protocol that allows users to be disconnected from the main messaging system and still be able to process mail. Users can store messages on a local machine or on a server.
ISAPI Filter
ISAPI filter - A replaceable DLL which the server calls whenever there is an HTTP request. When the filter is first loaded, it communicates to the server what sort of notifications will be accepted. After that, whenever a selected event occurs, the filter is called to process the event.