New York, May 22 (BridgeNews) - The euro tumbled to a six-month low of 86.63 cents on a poor Ifo index of west German business sentiment and on expected cash outflows for the rest of the year. Concerns of outflows flared after Morgan Stanley Capital International re-weighted on Saturday its global indices this weekend in favor of U.S. and U.K. stocks to the detriment of euro-zone assets, and after UBS Warburg research showed Continental Europe losing over $1 billion last week.