Groupon is moving from the once-lucrative model of daily deals into more direct e-commerce sales, bringing it into competition with powerhouses Amazon ( AMZN) and, to a lesser extent, eBay ( EBAY).

FORBES: Groupon: A Train Wreck in Public Sight

It is true that the combined firm would dominate the markets for instant messaging and web-based e-mail, but neither is lucrative.

ECONOMIST: Microsoft, Yahoo! and Google

It is the latest US e-commerce success to eye the lucrative European market, following on the successful launch of online retailer Amazon.

BBC: Priceline plunges on competition fears

Jackson lawyers argue the e-mail is evidence that AEG Live used Murray's fear of losing his lucrative job as Jackson's personal physician to pressure him to have Jackson ready for rehearsals despite his fragile health.

CNN: AEG Live to put Michael Jackson on trial in own death