Install of Exchange server after removal of previous

[Maxell]

Hello,

 

I have recently completed a migration to Office365 from our on-premises Exchange environment.

 

In order to remove the mailboxes from our internal servers, I had to uninstall our Exchange 2010 server. This completed successfully.

 

Now however, I need to get a very basic Exchange server installed onto our internal network again in order to manage and create mail objects that are to be used in Office365 (we DirSync our AD you see).

 

When I attempt to install Exchange again, it asks me to provide an organization name and then setup says it is going to prepare AD ready for an Exchange install (which has already done due to our previous setup prior to Office365 migration) and I am worried this will overwrite settings already in AD. Will it?

 

Has anyone been through this process at all? Thanks a lot for any help.

 

Mark.