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Cannot install Exchange 2013 as it thinks Exchange 2010 is there and it is not

I am setting up a hybrid solutions for Microsoft Office 365 with an organisation that is running Microsoft Exchange 2007.  Now everything is place but when installing Exchange 2013 it was detecting that the site needed Exchange 2010 with SP3 before it could continue.

This site is still running Exchange 2007 and there is no existence of Exchange 2010, however I think they may have run an install and this is what has caused AD checks to return the results.

Can someone suggest the best course of action in navigating this issue.  Is it best to install copy Exchange 2010 put SP3 on it and then continue will this have an affect on the Exchange 2007 environment?  Or is there another method I could look at.

Please help desperate for some answer fast as site is waiting for the cutover of services.
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1 Solution
Peter HutchisonSenior Network Systems SpecialistCommented:
You need to upgrade to Exchange 2007 SP3 and install Roll update 10 at least before you can migrate to 2013.

ITSystemSolAuthor Commented:
That has actually been done, but I think the customer has had exchange 2010 installed briefly and the Installation Wizard of Exchange 2013 is detecting that it also needs to be upgraded.  But Exchange 2010 no longer exists I think they ran installer and then just left it at that and removed the server.
Adam BrownSr Solutions ArchitectCommented:
You probably have remnants of the 2010 server stuck in your Active Directory database. You would need to go into ADSIEdit and remove that server from there. http://thlnk3r.wordpress.com/2013/04/17/how-to-remove-legacy-exchange-servers-using-adsiedit-tool/ has info on how to do this.
ITSystemSolAuthor Commented:
Precise solution for my issue.  Thankyou very much.
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