In the last part of the previous article, we have finished the discussion about a commonly-used POP3 class in the business logic tier of the sample system. In this article, we'll continue to discuss another part of the business logic tier - a higher-level business logic class - CommonLib, in which there are a lot of higher level of classes and helper methods to be used or called from the presentation layer to achieve various kinds of e-mail dealing tasks. 
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