The so-called store-within-a-store at Best Buy will offer Windows-based tablets and PCs, phones, Microsoft Office software, and Xbox consoles, the companies said today. Between this month and September the retail chain plans to allocate as much as 2,200 square feet of space at 600 U.S. and Canadian outlets to what will be called the Windows Store. These spaces will provide “a large-scale, hands-on customer experience that will show customers how Windows and Microsoft devices and services can make it easier for them to work and play,” Microsoft’s Tami Reller says. Best Buy will add more than 1,200 Microsoft-trained sales people at the Windows Stores. Microsoft also will have a presence on Best Buy’s Web site. This initiative follows the retailer’s agreement in April to launch similar internal stores for Samsung products as part of Best Buy’s effort to regain some of the market share it has been losing to online stores led by Amazon.