thew out 489 PBXs and switched over their 39,000 employees to using Microsoft
Lync, a unified commutations solution gaining in popularity. Sprint
Nextel said their goal was to "reduce its environmental impact, improve employee productivity, and reduce costs and administration for its cumbersome telephony systems". Whether they truly "threw out" the 489 PBXs and they're sitting in a landfill somewhere or they sold off the PBXs is unknown, but I'm hoping for the latter or it would defeat Sprint Nextel's purpose of "reduced environmental impact".
Here's what their Lync deployment / voice infrastructure looks like now:
Sprint Nextel claims that switching to Microsoft Lync has saved them nearly $13 million annually by reducing the TCO of maintaining hundreds of hardware-based PBXs, on-site maintenance fees, and annual upgrades. It went with Microsoft's software approach and leveraged Sprint's Global MPLS network and SIP trunking to connect their 39,000 employees together seamlessly allowing them to retire 489 PBXs scattered across the country.