Industry and company analysis

Can somebody help me make sense of the MSFT cannibalization example? Specifically, exhibit# 32 and 33 in reading 34 on page 188; I cannot make sense of the breakdown of operating expenses. 1) Why are the total operating expenses so different from exhibit 32 to 33 and 2) why do the total %s of total op expenes not adding up to 100% in exhibit 33- I’m sure i am missing something easy but this is driving me crazy.