Dropbox is letting go 20% of its workforce as the cloud company undergoes what CEO Drew Houston calls a “transitional period.” In a letter to staff, Houston said that the reduction in headcount would impact 528 people. The goal, he added, was to make cuts in areas where Dropbox has “over-invested” while designing a “flatter, more efficient” team structure. “As CEO, I take full responsibility for this decision and the circumstances that led to it, and I’m truly sorry to those impacted by this cha...