UPDATE 2-Logica Q3 sales fall 4 pct, lowers year forecast

* Q3 revenue 862 million pounds, pro forma drop of 4 percent

* Expects year revenue to fall 3 percent

* Maintains margin guidance at 7.5 percent

* Shares rise 3.8 percent in London

(Adds company comment, analyst reaction, shares)

By Paul Sandle

LONDON, Nov 4 (Reuters) - IT company Logica (LOG.L) (LOG.AS) cut its full-year guidance, saying revenue would fall 3 percent rather than an earlier forecast of about 2 percent, reflecting continued weak demand for consulting and professional services.

Logica, listed in Amsterdam and London, posted revenue of 862 million pounds ($1.4 billion) for the three months to end-September, 4 percent lower on a pro forma basis but just ahead of analyst expectations.

Outsourcing grew 11 percent, not enough to offset a 12 percent drop in consulting revenue with particular weakness in the industrial and financial sectors in Benelux and Germany.