Exchange Migration Step by Step Question

I am setting up to migrate a client from SBS 2008 Exchange to Server 2008 R2 with Exchange 2010.

I am following the instructions found here:

As I was going back and forth getting the prereqs on, I accidentally left all roles checked on the actual installation.

Thus I am on the step to install the CAS, but instead I installed all of the roles, CAS, Hub Transport, and Mailbox Server.

I figured, no problem I would just uninstall and continue from there.  I was able to uninstall the hub transport without issues, but when attempting to uninstall the Mailbox Server it errors having already created a "DiscoverySearchMailbox" that must be removed before removing the Mailbox Server role.

My question is, can I continue forward ignoring the fact that I installed the roles earlier than neccessary, or should I go through the process of removing the Mail Server role, so that I can continue the step by step as was intended?
Who is Participating?
AmitConnect With a Mentor IT ArchitectCommented:
I guess you need MBX and HUB role, then why to install. When first exchange server is install it creates few system related mailbox like discovery mailbox, in order to remove first exchange or mailbox role you need to either remove it or move them to another server.

However, i don't think you need to do anything.
AmitIT ArchitectCommented:
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AmitIT ArchitectCommented:
Hey it was why to un-install...ignore typo error :)
buddamanxAuthor Commented:
So because I will need the roles, there should be no problems leaving them installed and continuing with the migration steps, ignoring the ones that were done early?
AmitIT ArchitectCommented:
ya....that's correct
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