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NEW YORK (TheStreet) -- Two months since its debut, Microsoft's (MSFT) - Get Microsoft Corporation (MSFT) Report Windows Phone 7 platform hit a new milestone this week: It now features 5,000 apps in its marketplace.

While that's well behind the 300,000 available for

Apple's

(AAPL) - Get Apple Inc. (AAPL) Report

iOs and the some 200,000 on

Google's

(GOOG) - Get Alphabet Inc. Class C Report

Android, it does suggest that Microsoft, which also announced this month that it has sold 1.5 million Windows Phone 7 phones so far to retailers, has won support from developers, who initially seemed

hesitant to invest in the fledgling platform

.

Microsoft shares were flat in pre-market trading at $27.85.

On Thursday,

Amazon

(AMZN) - Get Amazon.com, Inc. Report

started allowing

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Kindle readers to share e-books

, in an attempt to stay ahead in the fast-growing e-reader market. While the service is free, only select books are available for lending; eligibility is up to publishers, Amazon noted.

Rival

Barnes & Noble's

(BKS) - Get Barnes & Noble, Inc. Report

Nook already offers the service.

Amazon shares were down 45 cents to $182.30 in pre-market trading.

Research In Motion's

(RIMM)

share price is down more than 3.5% this week, likely a response to analyst reports that said the BlackBerry maker's soon-to-launch tablet, the PlayBook, suffers from a short-life battery. RIM rebutted the claims, according to

Reuters

, noting that the battery life will be comparable to that of the competing tablets.

RIM's shares were down 12 cents at $57.95 in pre-market trading.

Web phone company

Skype

, which is preparing for its IPO, is apparently facing difficulties with its expansion into China. On Thursday, China's government announced that Internet-based phone calls administered by any other network other than China Telecom and China Unicom could be deemed illegal, according to multiple reports. The move would make Skype and other VoIP services banned from use in China.

The China news hit the same day that Skype announced the addition of

video calling to Apple's iOS platform.

Groupon

has already raised $500 million

worth of its planned

$950 million equity offering

, according documents filed with the SEC.

The local daily-deal startup, which a few weeks ago walked away from a reported

$6 billion acquisition deal with Google

, hasn't disclosed annual revenues, but reports have estimated sales of around $800 million.

--Written by Maggie Overfelt in New York.

>To follow the writer on Twitter, go to

http://twitter.com/maggieoverfelt

.

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