Compatibility with modules vtiger 5.2.1

Hi sandroe,
this is VTE is not vtiger, so we can't consider this as a problem.
Most of the core as been rewritten in order to innovate the developing with sdk and the functionallity in the user interface, same for the integration with exchange, gcalendar, zimbra and so on.
If you want to use vtiger modules use vtiger.
If you need new modules you can look at our sdk and develop them with few lines of code.
thank you
regards
davide