I think it's time to carefully consider issues related to possible upgrade to Lift 2.3 version. RC1 has been already released. Right now it implies only minor change in code: due to JsExp is no longer subclass of scala.xml.SpecialNode, implicit converson from Long to JsExp is not applicable for scala.xml.UnprefixedAttribute in Mailbox.scala. For more info see: http://groups.google.com/group/liftweb/browse_thread/thread/602de79127070b90 . It's easy to fix with toString call. More serious change relates to Extended Session (it is used to set a cookie and store userId into DB for subsequent automatic login). Currently used technique to bind Extended Session via S.addAround() call is not valid anymore and fails at runtime, see: http://groups.google.com/group/liftweb/browse_thread/thread/fa773ef9a5db50ca . It's neccessary to wait until new mechanism: LiftRules.earlyInStateful is introduced.