What part of EMC's business is growing fastest? What part is having difficulties?

EMC is a cash cow - which is why Dell acquired it. Storage always increases at a rate slightly better than market... the converged platforms group also does well because they sell a basic box that runs VMware and requires very little skill to setup and manage - another cash cow. However, there is simply nothing strategic about either of these businesses which is why Dell is getting it's clock cleaned by AWS, Oracle, Microsoft Azure and others who can provide all of these services in a outsourced model at a fraction of the cost.