Exchange 2007 Decommissioning, post Office 365 migration

Hello,
We have four Exchange 2007 servers in four different sites, single AD.  All four Exchange servers are CAS, Mailbox, Hub, secondary domain controllers.  We have migrated to Office 365 successfully, and would like to remove the Exchange 2007 servers. 
I have stopped the Exchange services on all four for at least a week and tested Office 365 mail flow with no issues.  My questions are:
1) Can I expect to simply uninstall Exchange 2007 from each server, one by one, without a negative impact to Active Directory?
2) Should/can the many Mailbox Databases be deleted prior to uninstalling Exchange 2007?  Not all mailboxes had to be migrated to Office 365, and they contain data that we no longer need. 
If there is a 'safe' method to remove Exchange in a multi-site setup, I would prefer to try that before having to dig through ADSIedit.
Thank you in advance.

Hi Chase,
here's an
official guide for uninstalling Exchange 2007. Please also note the other documents in the same library directory (see navigation pane to the left).
Cheers,
Fred
There's no place like 127.0.0.1

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