exchange 2010 coexisitense with both exchange 2007 and 2003

Hi, Can you have exchange 2010 coexistence with both exchange 2007 and 2003. I have one exchange 2003 box that basically houses our unity voice-mail mailbox and SMTP traffic, the public folders are replicated to our exchange 2007 box. We have 2 exchange
2007 box's, both with all three roles. I am getting ready to put in our first exchange 2010 box with the CAS/HT roles. Is it alright to have coexistence with all 3 and if so do I proceed like I am transitioning from exchange 2003 or from exchange 2007? Thank
you.  

Source: http://social.technet.microsoft.com/Forums/en-US/exchangesvrdeploy/thread/fe338638-8bf4-4ed7-a226-2a437e11f255

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