Quote:
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Originally Posted by http://www.mysql.com/company/legal/lifecycle/
MySQL Db Server___GA Date___Active Support Ends___Extended Support Ends
3.23_____________2001-01-17____2006-07-31__________2006-12-31
4.0______________2003-03-15____2006-09-30__________2008-12-31
4.1______________2004-10-23____2006-12-31__________2009-12-31
5.0______________2005-10-24____2008-12-31__________2011-12-31
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From the chart I just pulled from their site, it seems 4.x is already obsolete and 5.0 has about a year left. 5.1 is in RC and 6.0 is out and in Alpha.
Most the scripts I run are compatible with 4.1 but recommended for 5.0 with an emphasis on upgrading to 5.0 for future updates.