From
MicroCash is going to include every SolidCoin in it,
Does it mean that SolidCoin is converted to MicroCash? No more SolidCoin but MicroCash when it becomes active?
Yeah, basically what will happen is when MicroCash is ready to launch the SolidCoin network will stop at a certain block. All coins will then be carried forth into the new chain, using your SolidCoin addresses you'll be able to get a new MicroCash address and have the same funds without compromising your security. Your private and public keys are what makes the "address" you see, so since MicroCash is still using ECDSA it can morph to a new address format quite easily and return funds to every SolidCoin owner.
From what I gathered, 1 SolidCoin is going to equal 1 MicroCash dollar.