To include the iPad, or not include the iPad? It makes a big difference in notebook market shares. (Source: Deutsche Bank)

Most calculations of market share in the portable computing arena don’t include the iPad, which they consider a tablet and not a traditional computer. But because tablets seem to be cannibalizing computer sales, it’s not a stretch to include iPads in those tabulations.

Based on the line graph above, the notebook landscape changes drastically when iPad is included.

Deutsche Bank analyst Chris Whitmore calculated global notebook computer sales up until the second quarter of...