Teamsite Upgrade to 6.7 and IWmigrate

System

We are currently running Teamsite 6.5 Sp3 on a Windows platform. We are going through a planning project to see what it takes to upgrade to 6.7.1 from this environment.

Our last upgrade of Teamsite going from 6.1 to 6.5 SP2 involved the iwmigrate process on our store.

From the documentation I have read through I noticed they mention if coming from TS 5.5 to 6.1 that you are required to run IWMIGRATE.

My question is are we still required (or best practice) to perform iwmigrate on the store when moving from one version to another?

What I am trying to clarify is do we need to perform the iwmigrate from 6.5 SP3 to TS 6.7.1 or is it common upgrade process to copy the existing store since we already performed the iwmigrate during the last upgrade?

We are still going to the Windows operating system.
Thanks