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CS4 Master Collection is no longer for sale.
The only version currently for sale is CS5.5 Master Collection. You can pre-order now. The software will be available in May.
Trial versions of CS5 Master Collection are available until then. See http://www.adobe.com/support/creativesuite/
thanks, Because just learning this software,and so don't know about it.Can you give a about learning advice?
thinks,I'll go and see.