Theres probably not a lot of you left out there who are still using the old 1.23 standard viewer from Linden Lab, however fi you are be warned that the lab has pulled ALL support for this outdated viewer completley.
Removed download links from the old viewer wiki page
Removed as a supported viewer completley from the wiki page
It was also totally removed from the Alternative Downloads page as well. As has been said a few times by various Lindens, 2012 will be the year of the old 1.23 based viewers being completley depreciated by Linden Lab to the point that a lot of the new upcoming features, including the new inventory system will basically break all 1.23 based viewers including Pheonix Viewer.