Here is the 21st release of the 1.0 version of symfony. 2 years ago, symfony core team was very proud to release the version 1.0.0. Lot of things have changed since then but we know there are a lot of websites that have been running sf1.0 all this time and they are still running !

Here is the changelog of the 1.0.20:

r16170: fixed typo (closes #6014)
r16165: added some missing PHPDoc (closes #6054)
r15765: fixed propel:schema-to-yml composite foreign-Keys wrongly converted (closes #5483)
r15263: fixed issue with cache file corruption due to heavy load. (closes #5729)
r15223: escaped variables in exceptions in the development environment (closes #5743)
r14385: fixed i18N and open_basedir restriction problem (closes #1445)
r14266: improvement in search_in performance of sfFinder when not searching symlinks (closes #5431)
r14120: fixed select_timezone_tag not possible to display city. (closes #5359)
r13893: backported performance patch for sfToolkit::stripComments. (closes #5237)
r13416: fixed sfRequest::getUri() when using Microsoft IIS (closes #4886)
r13408: fixed long line in a PHP doc (closes #4750)
r13386: added mime type for PDF (closes #4483)