IBM revenue misses on weakness in its biggest unit; shares fall 5%

(Reuters) - International Business Machines Corp missed Wall Street estimates for quarterly revenue on Wednesday, as its global technology services unit was hit by weakness in some European markets, sending its shares down 5% in extended trading.IBM, which wrapped up its acquisition of Linux maker Red Hat Inc earlier this year, has faced years of revenue decline amid its shift to the cloud from its traditional businesses, including mainframe servers.Sales from global technology services, IBM's..