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If I use version 19.0 for webservices API , I get UNSUPPORTED_API_VERSION

I am trying to login at

My account is


<?xml version="1.0" encoding="UTF-8"?><soapenv:Envelope xmlns:soapenv="
/envelope/" xmlns:sf="" xmlns:xsi=""
: Invalid Api version specified on URL</faultstring><detail><sf:UnexpectedErrorFault xsi:type="sf:UnexpectedErrorFault"
><sf:exceptionCode>UNSUPPORTED_API_VERSION</sf:exceptionCode><sf:exceptionMessage>Invalid Api version
specified on URL</sf:exceptionMessage></sf:UnexpectedErrorFault></detail></soapenv:Fault></soapenv:Body
Best Answer chosen by Admin (Salesforce Developers) 

v19 (aka Summer'10) is only available on the sandbox instances currently, see the upgrade schedule on for the dates for the other instances.