How long will 3.x be supported for?
 

Moving my phpbb site over to Vbulletin. I cant use V4 because Impex and also VBSeo is not yet ready for it.

With the new move I intend to buy a custom skin* and to save my members from experiencing change too often will probably stick with version 3.x for as long as possible.

Will there come a point that 3.x is no longer supported in terms of security upgrades* forum support etc. If so* when is that likely to be.