The question asks to find the mismatch between company names and their old names. The word before ":" represents the old name and the word after ":" represents the new name. Let's break down the options:
Option A: Andersen Consulting :: Accenture
Andersen Consulting rebranded as Accenture, which is correct. This is a proper match.
Option B: Isis Chocolates :: Libeert
Isis Chocolates was rebranded as Libeert, so this is also a valid match.
Option C: Brad’s Drink :: Pepsi
Brad’s Drink was rebranded as Pepsi. This is correct.
Option D: Quantum Computer Services :: AOL Inc.
Quantum Computer Services was rebranded as AOL Inc., so this is also correct.
Option E: BearingPoint :: KPMG Consulting Inc.
This option is a mismatch. KPMG Consulting was rebranded as BearingPoint, not the other way around. Hence, this is the incorrect match.
Thus, the correct answer is option (E), which is a mismatch.
Final Answer:
\[
\boxed{\text{(E) BearingPoint :: KPMG Consulting Inc.}}
\]