tablespace SAP<SID>640 after upgrade

We have upgraded our XI dev system to NWSR2 PI 7.0.

As a part of the upgrade, created a table space <b>SAP<SID>700</b>, which as the name says is a replacement for <b>SAP<SID>640</b>.

What happens to the tablespace <b>SAP<SID>640</b> after upgrade?

In DB02, tablespace <b>SAP<SID>640</b> is totally free. 11Gbs of 11Gbs is free.

Can we drop this tablespace.

thanks,

-naveen.