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difference between mail n messaging

 
Greenhorn
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what is the difference between e-mailing and instant messaging.
 
Ranch Hand
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My interpretation:
E-Mail - Messages sent much like regular mail. It can be sent to anybody as long as they have an email address. Messages reside on a server until they are picked up (mostly the messages still reside on the server until deleted).
Instant Messaging - Restricted usually to the server that is providing the service. Mainly used for IMMEDIATE notifications of messages as soon as the individual is "online". Disadvantage - Individual has to be online in order to recieve an Instant Message (Hence - "Instant Message").
Programs such as ICQ and Yahoo Messenger allow sending of messages and notifying the user as soon as they are online (Kind of like an email client - Outlook, etc.)
 
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