Umm, because the 6 month release cylce is too frequent to keep a stable product? Hence the LTS title (long term support) which means Zimbra techies can set up a semi-automated build system, fine-tune it, and only have to do it once every two years.
On a 6 month cycle, the quirks specific to that version of the OS will most likely only just be ironed out at the end of the 6 months. |