(Reuters) - Adobe Inc forecast current-quarter revenue below analysts' estimates, overshadowing its first-quarter revenue beat that was driven by growth in its digital media business.The company expects to report revenue of about $2.70 billion (2 billion pounds) for the second quarter, below estimates of $2.72 billion, sending its shares down 2.3 percent in extended trading.Revenue from Adobe's digital media business, which houses the popular image-editing software Photoshop, surged 22 percent..