SAN FRANCISCO -- Published reports say Microsoft is in talks to buy Yammer, a company that develops private social networks for companies.

Bloomberg News and The Wall Street Journal, citing people familiar with the matter, report that Microsoft could pay more than $1 billion for San Francisco-based Yammer. The networks developed by Yammer allow a company's employees to communicate and collaborate in a manner similar to the way Facebook works with friends.

Shelly Risk, a spokeswoman for privately held Yammer, says the company has no comment on the reports. Representatives for Microsoft, based in Redmond, Wash., could not be reached for comment late Thursday.

Yammer says its social networks are used by more than 200,000 companies worldwide. The reports Thursday say Microsoft could add Yammer's social-networking functions to its Office software suite.

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Check out the gallery to see some of Microsoft's worst gadget flops.
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  • Kin 1 and Kin 2

    The <a href="http://www.huffingtonpost.com/2010/07/01/microsoft-kin-dead-micros_n_631439.html" target="_hplink">Microsoft Kin</a> smartphones debuted in April 2010. Marketed for teens, the devices were priced at $50 for the Kin 1, $100 for the Kin 2. Less appealing were Verizon's $70-per-month subscription plans, as were early reviews calling the devices "<a href="http://www.huffingtonpost.com/2010/05/13/microsoft-kin-review-phot_n_574697.html" target="_hplink">not smart enough</a>" and "<a href="http://dvice.com/archives/2010/04/why-microsoft-k.php" target="_hplink">downright ugly</a>." In June, Microsoft pulled the plug on the Kin family and focused exclusively on Windows Phone 7.

  • Spot Watch

    Launched in 2004, the Smart Personal Objects Technology (SPOT) watches connected to Microsoft's FM radio-based network (MSN Direct) and delivered weather reports, news snippets, stocks and sports scores to users. <a href="http://news.cnet.com/8301-17938_105-9927213-1.html" target="_hplink">Writes</a> CNET, "Microsoft put a lot of money behind the Smart Watch and partnered up with Fossil, Suunto, Swatch, and even Tissot, which produced a high-end, touch-screen model that cost $800." Critics and consumers were not buying it, though. <em>Washington Post</em> reviewer Rob Pegoraro tested a $300 Suunto model and <a href="http://voices.washingtonpost.com/fasterforward/2008/04/microsofts_spot_watch_winds_do.html" target="_hplink">wrote</a> the following: "[It was] too big, too ugly, too useless, too expensive (especially with a $9.95/month subscription charge for Microsoft's MSN Direct data service)." The devices were discontinued in 2008.

  • Courier Tablet

    The <a href="http://www.huffingtonpost.com/2010/04/29/microsoft-courier-cancele_n_557493.html" target="_hplink">Courier Tablet</a>, leaked in 2009, was expected to be announced shortly before the iPad's debut in January 2010. According to rumors, the device would have featured two seven-inch screens that folded shut. However, this innovative twist on the tablet PC never saw the light of day. Microsoft instead unveiled a comparatively "<a href="http://www.huffingtonpost.com/2010/01/07/hp-slate-tablet-microsoft_n_414364.html" target="_hplink">underwhelming</a>" single-panel tablet device called the <a href="http://www.huffingtonpost.com/2010/01/07/hp-slate-tablet-microsoft_n_414364.html" target="_hplink">HP Slate</a>, which PCWorld called "<a href="http://www.pcworld.com/businesscenter/article/186247/hp_slate_lowers_the_bar_for_apples_tablet_pc.html#tk.mod_rel" target="_hplink">a mediocre device</a>" and "<a href="http://www.pcworld.com/article/186172/why_the_microsofthp_tablet_is_a_big_disappointment.html" target="_hplink">a big disappointment</a>." By late April, both the Courier Tablet project and the HP Slate were tabled. <blockquote><strong>UPDATE:</strong> A post written for the official Microsoft Blog in 2010 clarified that the Courier "project" was <a href="http://blogs.technet.com/b/microsoft_blog/archive/2010/04/29/speculation-about-the-courier-project.aspx" target="_hplink">never an official Microsoft product</a>. The statement read: "<em>At any given time, across any of our business groups, there are new ideas being investigated, tested, and incubated. It's in Microsoft's DNA to continually develop and incubate new technologies to foster productivity and creativity. The 'Courier' project is an example of this type of effort and its technologies will be evaluated for use in future Microsoft offerings</em>." The HP Slate was the result of a partnership between Microsoft and Hewett-Packard.</blockquote>

  • Windows Ultra-Mobile PC

    The first hand-held devices built on Microsoft's unique Ultra-Mobile PC platform launched to ample buzz in 2006. This new class of powerful mini-devices, which accepted pen and touch input, never caught on. The first U.S. release, the Samsung Q1, received <a href="http://www.pcworld.com/article/125919/mobile_computing_ultra_mobile_pc_update.html" target="_hplink">poor reviews</a> because of its hefty price tag ($1,099), buggy software, and odd keyboard design. Other releases suffered similarly.

  • The Zune

    Microsoft's answer to the iPod hasn't had a good run. The Zune's share of the mp3 player market peaked at 10%, slumping to 2% in 2009, according to <a href="http://www.investorplace.com/34097/microsoft-kills-zune-mp3-player-smartphones-windows-phone-7/" target="_hplink">Investor Place.</a> <a href="http://www.bloomberg.com/news/2011-03-14/microsoft-said-to-stop-releasing-new-zune-models-as-demand-ebbs.html" target="_hplink">Bloomberg</a> reported that Microsoft would be killing off its music player due to "tepid demand" and cease releasing new models, though it would continue developing the Zune software. <blockquote><strong>UPDATE:</strong> <a href="http://zune.net/en-US/products/software/download/default.htm" target="_hplink">Microsoft announced on October 3</a> that it "will no longer be producing Zune players."</blockquote>

  • MSN TV

    Microsoft's MSN TV (aka WebTV) was a service that allowed users to access the Internet via their televisions. The product, which may have been ahead of its time, was ultimately a flop, failing to attract more than 1 million subscribers. The <a href="http://cachef.ft.com/cms/s/0/a20ccd80-d16e-11df-96d1-00144feabdc0,s01=1.html#axzz1GxNEJiL8" target="_hplink">Financial Times</a> wrote of Microsoft's efforts, "Surfing the TV on a keyboard and web browser sounds about as enticing as pushing a rickety shopping cart across the plush carpet of a designer boutique."