Uninstall/Re install Exchange 2013

Hi Experts,
Since I can't get my Exchange 2013 to send or receive emails I want to re-install it. Trying to uninstall it tells me that there are arbitration mailboxes that are preventing it.
I am trying to migrate from exchange 2007 to 2013 on 2 different Servers I went through the install following this:
http://technet.microsoft.com/en-US/exdeploy2013/Checklist?state=2419-W-AQAEAAAAQAAAAAEAAAAAAAA~
and stopped before migrating the mailboxes because no 2013 user could send or recieve emails.. The 2013 server is not sending or recieving emails but the 2007 still is. Here is the full story on that:
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Q_28565686.html

There are 4 arbitration boxes.

$AM = Get-Mailbox "Arbitration Mailbox01" -Arbitration
$AMDN = $AM.DistinguishedName
Get-Recipient -RecipientPreviewFilter {ArbitrationMailbox -eq $AMDN}

This shows that all the 2007 mail boxes are using all four of the Arbitration boxes.
So my question is If I disable or remove these Arbitration boxes to facilitate a re-install will that effect users getting mail? Is the mail currently going through the 2013 server to the 2007?
ratherbyAsked:
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suriyaehnopCommented:
Exchange 2007 doesn't have arbitration mailbox. This arbitration started on Exchange 2010. After you install Exchange 2013, it will create a default arbitration mailbox. Have you try to create a database on Exchange 2007 to host these arbitration mailbox. Then move them to this database, then try to uninstall Exchange 2013.

or have look at this link:

https://social.technet.microsoft.com/Forums/exchange/en-US/4726db53-b5ac-488a-a801-a4774ffcdc34/cannot-uninstall-exchange-2013
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ratherbyAuthor Commented:
I disabled all the arbitration mail boxes and then uninstalled Exchange 2013.
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suriyaehnopCommented:
Are you able to uninstall Exchange 2013?
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