Starcraft – How was Kerrigan able to read data in “The Moebius Factor” but not “With Friends Like These…”

In The Moebius Factor, Commander Raynor chases Kerrigan around Tyrador VIII destroying data cores before Kerrigan can access them. In the prologue to With Friends List These…, Kerrigan has a discussion with Abathur on why the Zerg couldn't access the Terran network, and Abathur said that it was because the Zerg are too complex to understand Terran communications.

Why then, was the old Queen of Blades able to access (presumably encrypted) data from the Moebius Foundation, but the new queen of blades was not able to access information from a terran network?