Transfer from STPI Unit to SEZ

Hi,

We are a software service company presently registered as an STPI Unit since last 3 years;

Since the tax exemption for STPI Unit is over, we are exploring the option of getting transferring to SEZ area.

Can any body advice if an STPI Unit tranfer to SEZ area;

Can we continue to get the tax exemption in the SEZ? If yes for how long and what would be conditions attached to it.

In case any body has any information on the above would be highly useful

Many thanks in advance

Best Regards

Ramesh