<p>That's how much Morgan Stanley's Adam Holt estimates Microsoft (MSFT) may be leaving on the table by not offering a full version of its Office suite (Word, Excel, etc.) on Apple's (AAPL) iPads.</p><p>Here how he gets that number.</p><p>For starters he estimates that Microsoft probably sold fewer than 1 million Windows-based tablets last year and will be hard pressed to capture 10% of the tablet market this year -- especially with stalwart partners like Hewlett-Packard (HPQ) reportedly choosing Android over Windows 8 for its forthcoming mobile devices.</p><p>He also reports that three to four times as many Mac users (30-40%) install paid versions of Office on their machines as Windows PC users (10-15%) do -- a difference that feels too high unless he's not counting the discounted versions of Office Home edition that come bundled with new PCs.</p><p><a href="http://tech.fortune.cnn.com/2013/02/14/office-for-apple-ipad/">Keep reading...</a></p><p>Read also:</p><p><a href="http://moneymorning.com/2013/02/14/buy-sell-or-hold-is-microsoft-stock-about-to-break-out-of-its-10-year-slumber/">Is Microsoft Stock About to Break Out of Its 10-Year Slumber?</a> (Money Morning)</p><p><a href="http://www.citeworld.com/tablets/21431/morgan-stanley-office-ios-may-be-missing-important-office-365-reality">One big flaw in that $ 2.5 billion estimate for Office on iPad</a> (CITEworld)</p><p>Explore: <a href="http://news.google.com/news/more?ncl=d_ZZX8Df_z7ZSrMdiWIYLy-9fm3gM&ned=us">26 additional articles.</a></p>