Transition to Ex2013

Hi Everyone,

I am using Exchange Server 2007 SP3, i want to do the transition to Exchange Server 2013 SP1,

1.Before proceeding with installation  Should i disable ipv6 on Exchange 2007SP3 and Can i also disable
ipv6 on Exchange 2013(My Environment is ipv4) 
Earlier i had an issue when i upgraded Exchange SP1 to SP3 i had disabled ipv6 and my information store service 
was not running until i enabled ipV6

2.Should i enable Windows Authentication in IIS(for RPC)(for active sync authentication).
It is disabled .

3. wht else do i need to take care of before proceeding to Exchange Server 2013
I am using Exchange Server 2007 SP3 with  update Rollup 10