Edited excerpt:

Inside Al-Qaeda’s Hard Drive
Budget squabbles, baby pictures, office rivalries—and the path to 9/11

by Alan Cullison

My acquisition of the al-Qaeda computers was unique in the experience of journalists covering radical Islam. On the night before Kabul fell, Taliban officials were fleeing the city in trucks teetering with their personal effects. The looter who sold me the computers figured that al-Qaeda had fled as well, so he crawled over a brick wall surrounding the house that served as the group's office. On the door of the room, he said, was the name of Muhammad Atef—al-Qaeda's military commander and a key planner of 9/11. Each day, he said, Atef would walk into the office carrying the laptop in its black case. The looter knew he had something good.

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What emerged was an astonishing inside look at the day-to-day world of al-Qaeda, as managed by its top strategic planners—among them bin Laden, al-Zawahiri, Atef, Ramzi bin al-Shibh, and Khalid Sheikh Muhammad, all of whom were intimately involved in the planning of 9/11, and some of whom (bin Laden and al-Zawahiri) are still at large. Perhaps one of the most important insights to emerge from the computer is that 9/11 sprang not so much from al-Qaeda's strengths as from its weaknesses. The computer did not reveal any links to Iraq or any other deep-pocketed government; amid the group's penury the members fell to bitter infighting. The blow against the United States was meant to put an end to the internal rivalries, which are manifest in vitriolic memos between Kabul and cells abroad. Al-Qaeda's leaders worried about a military response from the United States, but in such a response they spied opportunity: they had fought the Soviet Union in Afghanistan, and they fondly remembered that war as a galvanizing experience, an event that roused the indifferent of the Arab world to fight and win against a technologically superior Western infidel. The jihadis expected the United States, like the Soviet Union, to be a clumsy opponent. Afghanistan would again become a slowly filling graveyard for the imperial ambitions of a superpower.