Many years around 2005 I heard a CIA report which stated Osama was in Pakistan. Both India and Afghanistan have said to the US that Osama was in Pakistan with the support of Pakistani Intelligence (ISI).
President Bush was more focused in Iraq. On March 13th, 2002, President Bush claimed he was not interested in finding Osama. He said he was "..not concerned", and claimed that Osama was not worth looking for. In 2006, Bush closed down the CIA team assigned to look for Osama. President Musharraf told everyone that Osama is probably dead, even though he did not provide evidence.
Well, I am glad that Obama kept his election promise and re-activated the search of Osama without getting the Pakistan involved.
Before President Bush, President Clinton got evidence of Osama's hideout in Afghanistan. Clinton ordered a cruise missile attack to that hide-out
However, the Clinton administration made one critical mistake.
He informed the Pakistan Intelligence of the impending cruise missile attack. The cruise missile launch from the sea had to overfly Pakistani airspace. Very soon Osama and his gang escaped just in time.
If you connect the dots, do you will see why Obama was successful.