Many subscribers will be in for a surprise when the latest issue of Forbes Magazine arrives on doorsteps and newsstands. Microsoft has embedded a Wi-Fi router in select copies of the May 6th print edition of the magazine, which gives users 15 days of free Wi-Fi through T-Mobile. The free Wi-Fi is part of Microsoft’s latest campaign to promote its subscription-based Office 365 service. The router lasts for three hours before it must be recharged using the included microUSB cable. Once activated, up to five devices at a time can be connected to the hotspot until the free service expires.