I was stuck with a broken Exchange 2013 installation (brand new, too - never could fix the 'emails stuck in drafts folder' issue). I also couldn't uninstall Exchange 2013, because I couldn't delete all the mailboxes in it (access to the error message was denied...). And, once you install Exchange 2013 in your domain, you can't install another previous version in the same forest.
Fix: Open up ADSI Edit, connect to your domain, and choose 'Default naming context'. When ADSI Edit has connected, look in the folder directly under "Default naming context [your.domain.com]". It is named with your domain's distinguished name. Delete these folders:
CN=Microsoft Exchange Security Groups
CN=Microsoft Exchange Security Objects
Now change the ADSI Edit connection from 'Default naming context' to 'Configuration' and look in the folder directly under it. Go to the "CN=Services" folder, then delete these folders:
CN=Microsoft Exchange
CN=Microsoft Exchange Autodiscover
You'll also have to delete some user accounts, but this was the step that took me the longest to figure out. Thanks to this site for the info: http://blog.dargel.at/2012/11/20/complete-remove-exchange-2013-using-adsiedit/
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