Networking can make or break a virtual desktop infrastructure (VDI) roll-out, as one business found out. The company, a global law firm, operates a multiprotocol label switching (MPLS) wide area network (WAN) between its three global sites, supporting 7,000 staff. Approximately 75% of traffic on the network was Citrix, 20% was taken by print services, while the remainder was used by web and authentication protocols. Sometimes the Citrix client on users' desktops would not keep up with their typing due to congestion on the WAN. Given that the cost of upgrading links in certain regions can be around £250,000 per annum, the law firm could not justify buying more network capacity. Deploying quality of service (QoS) to prioritise Citrix traffic could work, but at the cost of slower print traffic.