Perl
From Rackspace Email & Apps API
Please note that with the release of SOAP::Lite version 0.69, simple access to ASP-based SOAP API's was broken and somewhat more complex steps are needed. So far, only the GetCurrentUserMailboxSize documentation has been updated to demonstrate how to use the API with current versions of SOAP::Lite.
See these:
Commandline Perl tool
SessionID
GetCurrentUserMailboxSize - updated for SOAP::Lite 0.69
ModifyUser
GetDisplayPreferences