Forrester evaluated leading managed security service providers (MSSPs) across 56 criteria and found that VeriSign and IBM have established early managed security services (MSS) leadership, thanks to their managed security services capabilities and well-balanced offerings. Vendors Symantec, Unisys, SecureWorks, Solutionary, Getronics, and BT Global Services are all Strong Performers but fall short in the areas of completeness and balance compared with the Leaders. Verizon Business has a strong offering but has yet to assemble a strategy adequate for its potential. And despite exceptionally strong mobile and wireless capabilities, Sprint has not gotten traction in MSS and trails the field.