A server includes a mid-plane board, a storage backplane module, a plurality of first storage units, a vertical interposer board, a first electronic module, a second electronic module and a plurality of power supply units. The vertical interposer board is vertically inserted and thus electrically coupled to the mid-plane board. The storage backplane module, the vertical interposer board, the first electronic module, the second electronic module and the power supply units are electrically connected to each other through the mid-plane board.