Waltham online marketing company Constant Contact Inc. said third-quarter profit rose 22 percent as revenue climbed, although the rate at which trial users were converted into customers was below expectations. The company also raised its forecast of full-year adjusted profit to between 54 and 56 cents per share. The company also lowered its full-year revenue outlook to between $251.1 million and $251.4 million. Analysts expected $253.5 million. CEO Gail Goodman said the transformation into a multiproduct firm “will take a bit longer than we had envisioned.”
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