Juniper Networks ( JNPR) estimates reduced at UBS through 2010. Checks show that Enterprise segment is weak in Europe. Buy rating and $21 price target. Paychex ( PAYX) estimates lowered at Barclays through 2010. Company can't cut costs fast enough to offset weak revenue. Equal-weight rating and $25 price target. Red Hat ( RHT) estimates, target increased at UBS to $16. Estimates also boosted, because of strong billings and tight expense controls. Neutral rating. Constellation Brands ( STZ) numbers cut at UBS through 2010. Company seeing lower results from the international business. Debt paydown remains a top issue. Buy rating and new $16 price target. Tyco Electronics ( TEL) estimates, target cut at UBS. Shares now seen reaching $11.50. Estimates also lowered, based on poor end-market demand. Neutral rating.