PC World reports that affected users endured email delivery delays and difficulties downloading attachments. The cause was a 'very rare' dual network failure, which brought down two separate, redundant network paths, according to the report. 'The two network failures were unrelated, but in combination they reduced Gmails capacity to deliver messages to users,' Google spokesperson Sabrina Farmer is quoted in the report as saying. The report notes Google staffers will now work on bulking up network and backup capacity for Gmail, as well as on making Gmail's message delivery more resilient in the event of a network crash. Full PC World report