NEW YORK (CNNMoney) -- Microsoft is investing $300 million with bookseller Barnes & Noble for a 17.6% stake in its digital e-book reader the Nook.
The move, which was announced Monday, follows a statement from Barnes & Noble in January that it planned to spin off its Nook business.
Microsoft's investment values the overall Nook business at $1.7 billion, which is more than twice the $792 market value for all of Barnes & Noble at the close Friday.
Shares of Barnes & Noble nearly doubled, shoot up 95% in pre-market trading Monday, gaining $13.02 to $26.70 on the annoucement. Shares of Microsoft edged up 0.3% to $32.07.
The deal will also include a Nook application for Windows 8, Microsoft's main operating system.
The companies' statement says the app will create potentially hundreds of millions of new customers for Barnes & Noble's catalogues of e-books, magazines and newspapers. But left unsaid is that the app will reduce the need for potential customers to purchase the Nook to read those digital books and publications.
In January, Barnes & Noble announced that holiday sales for the Nook unit, including devices and e-books, increased 43% compared to last year, to $448 million.
Barnes & Noble also warned then that it expected a bigger than expected loss for this year. It blamed that partly on weak sales of the Nook Simple Touch, the company's $99 black-and-white e-reader. It also said sales of its $249 color Nook Tablet, released in November, topped expectations.
It also said in January that it planned to increase its investments in its Nook line, ramping up advertising and international expansion -- another factor driving the larger loss estimate. The investment from Microsoft could limit those losses.
The Nook has been struggling in competition to the Kindle products from Barnes & Noble's online rival Amazon.com. While neither company releases sales figures for the devices, Amazon announced in December that it had sold 1 million Kindles for each of three weeks in a row.
-- Staff writer Julianne Pepitone contributed to this report.
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