Zander's departure adds to the growing list of executives that Sun has recently shed. The trend began last month when John Shoemaker, Sun's executive vice-president of computer systems, announced that he would be leaving in July.
Then last week, the company's chief financial officer Michael Lehman said that he too was retiring. A day later, Larry Hambly, executive vice-president of the company's Enterprise Services group, also announced his departure.
The executive reshuffling comes after the company reported a third-quarter results slightly above analyst expectations, marking what some analysts believe is Sun's return to profitability.
In July, Zander will hand over full-time responsibilities to Sun's chief executive officer and chairman, Scott McNealy. Zander will remain in a "mentoring" role throughout the calendar year, Sun said.