In fact Peter Openheimer referenced IDC in this last conference call, saying Apple declined less than the PC market in unit sales so it increased share.
During a conference call, CFO Peter Oppenheimer told financials analysts that IDC had pegged the PC market decline 14 percent during the same period
The fact that Oppenheimer referenced them means zip. Zilch. Zero. Their methodology makes no sense whatsoever.
You need to look up the meaning of "actual" (which is what I was responding to in your post in this thread).
If we're in the world of estimates, there's a lot of other data -- and collateral evidence -- that contradicts IDC's numbers. I asked you guys a simple set of questions about IDC's "methodology" and none of you were able to answer that. That still stands.