Contoso is a medium-sized insurance company with around 5,000 employees operating from the main business area in Seattle. It has about 2,000 people who are field service insurance agents and are stationed outside their main company at 20 general agencies in Seattle, each with about 10 employees. The company planned to perform a nationwide Windows XP to Windows 8 Upgrade for all PC workstations at the end of the year.

All employees have an MS Exchange e-mail account (On-Premise version) and enterprise Office Professional license. The insurance software that allows range calculations and claims regulations is Citrix based and runs as a terminal server application in the enterprise environment.

For telephony, the customer has a Siemens HiPath 4000 PBX system located in the main office and several small telephone systems from different manufacturers in the general agencies. From the network point of view, the general agencies are connected via a redundant Multi Protocol Label...