The most recent evidence, a PR Newswire press release (Sources 8 and 11), explicitly states Microsoft's board declared a new quarterly dividend of $0.91 per share. Multiple other sources (1, 2, 3, 5, 10) corroborate that the previous dividend was $0.83 per share. The increase from $0.83 to $0.91 represents a 9.64% increase, which makes the statement's claim of a 10% increase a reasonable approximation.