Rackspace Exchnage Login
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According to Rackspace, the problem lies with using the same email for the Microsoft Office 365 account and Rackspace's hosted Exchange. According to them, the mix up is because Microsoft is trying to force the Exchange client (Outlook 2016) to connect to Microsoft's servers directly instead of the hosted Exchange she has via Rackspace.
Say yes to Microsoft Exchange and no to the cost and headaches of managing it. Our deep Microsoft hosting knowledge is just one reason we're a leading Exchange provider. Plus, with Hosted Exchange 2016 at Rackspace you get huge 100GB mailboxes and 50MB attachments.
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