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In page Instant messaging:

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Instant messaging products can usually be categorised into two types: Enterprise Instant Messaging (EIM)[1] and Consumer Instant Messaging (CIM).[2] Enterprise solutions use an internal IM server, however this is not always feasible, particularly for smaller businesses with limited budgets. The second option, using a CIM provides the advantage of being inexpensive to implement and has little need for investing in new hardware or server software. IM is increasingly becoming a feature of enterprise software rather than a stand-alone application.[citation needed]