Is CSF essentially an ESB?

Is CSF essentially performing some of the same role as an Enterprise Service Bus (ESB) product such as those available from vendors such as Sonic or IBM? If not, how is it different?
[182 byte] By [AlexHoffman] at [2008-2-28]
# 1
CSF is a framework and ESB is part of the architecture that makes up the platform. You can obviously leave ESB aside if you don't want to use it in your architecture but considering if you want to integrate things in a SOA manner, ESB is good to have.
TKL888 at 2007-9-3 > top of Msdn Tech,Connected Services Framework,Connected Services Framework...
# 2

CSF performs a set of governance functions needed to manage a system of services in addition to performing a "session" management function for integrating services to build composite services. You can think of the session management function as being akin to "a virtual instance of an ESB created for each aggregation or mashup." This allows CSF to be much more flexible because each aggregation is "context" driven to the aggregation you are building and not generic across a "common" bus per-se.

balab_msft at 2007-9-3 > top of Msdn Tech,Connected Services Framework,Connected Services Framework...
# 3

A follow-up question - can one assume that session mgmt is a combination of "ESB"+"run time goverance"+ orchestration?

mystry at 2007-9-3 > top of Msdn Tech,Connected Services Framework,Connected Services Framework...