By Benjamin Pimentel, MarketWatch

SAN FRANCISCO (MarketWatch) -- Technology stocks were mostly lower Monday, and shares of Oracle Corp. slipped after the corporate-software giant announced it was buying Acme Packet Inc. in a $1.7 billion deal.

Oracle (ORCL) shed 3% to close at $35.13 after the company said it was acquiring Acme Packet (APKT) for $29.25 a share. Shares of the Bedford, Mass.-based networking-technology company soared 23.7% to $29.59.

In a note, Nomura Equity Research analyst Rick Sherlund wrote that Acme Packet's technology can help Oracle "better enable communications across service-provider and enterprise networks, as well as across different devices."

"This likely bolsters Oracle's positioning in the mobile space, as well as helping to build out offerings around the company's cloud application deployments," he said.

The sector also got a lift from shares of BlackBerry (RIMM), formerly known as Research In Motion Ltd., which began trading under a new ticker Monday. BlackBerry was up 15% to close at $14.98.

The handset maker was bolstered by a Bernstein Research upgrade. Analyst Pierre Ferragu raised his rating to outperform from market perform, saying: "We have grown more confident in the likely success of the BlackBerry 10 launch, supported by low channel inventories, strong operator support and material pent-up demand."

But tech stocks were mostly down, with the Nasdaq Composite Index (RIXF) giving up 48 points, or 1.5%, to close at 3,131.

Among the decliners were Google Inc. (GOOG), which was off 2.1% to close at $759.02. BMO Capital downgraded the stock to market perform, arguing that "investor sentiment has changed materially" given worries about declining cost per clicks and the impact of the Motorola Mobility acquisition.

Also down were shares of Facebook Inc. (FB), which gave up 5.5% at $28.11.

Dell Inc. (DELL) shed 2.6% at $13.27, while Apple Inc. (AAPL) was off 2.5% to close at $442.32.

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