When you access the new Exchange Admin Center in Exchange Server 2013 (currently beta 2), you might receive an access denied when you login, like the one below.
Cause:
Your Admin account is, on a lower Exchange version like Exchange 2010 or Exchange 2007.
Solution:
You can either move you admin account from powershell with the move-mailbox cmdlet or instead attached the last part of this url (with bold): https://servername.company.local/ecp?exchClientver=15
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