After the ecstatic release of Joomla 1.6 on Jan 10th, 2011, developers and companies are baffled with the decision to either migrate the Joomla 1.5 sites to the newer version or whether to build the new sites using 1.6 versions. It was really a tough decision as the release of the 1.6 was four years in the making, while version 1.5 was constantly being updated, with 1.5.22 being the latest adaptation.

The  announcement by Ian MacLennan regarding the time lines and the life cycle path of each release is summarized in the following points:

Conclusion: This clearly depicts that 1.5 is the first LTS (Long Term Support) and will receive support until April 2012. 1.6 will be supported until the next release [1.7] that is due in July of 2011 [6 Months]. It will then be supported for another 6 months and eventually in January of 2012, the second LTS will be released. This LTS version will be supported for 15 months, therefore concluding that there is no need to migrate to 1.6 or 1.7. Unless of course if you require the granular access or nested categories features of these versions. Once the next LTS is released and extensions and templates catch up, it is good migrating from 1.5 to the January release.