Outlook password prompt for mailboxes on Exchange 2013 CU1

I migrated a few users from our Exchange 2007 SP3 Update 10 server to Exchange 2013 CU1. Now in Outlook they are getting a password prompt, and it won't accept their password. Our public folders are still on Exchange 2007 if that makes a difference.

I tried running 

     Test-OutlookConnectivity -GetDefaultsFromAutoDiscover:$true

but it says it doesn't recognize the parameter -GetDefaultsFromAutoDiscover:$true

Here's the values for Get-OutlookAnywhere:

ExternalHostname                   : legacy.domain.com
InternalHostname                   :
ExternalClientAuthenticationMethod : Ntlm
InternalClientAuthenticationMethod : Ntlm
IISAuthenticationMethods           : {Ntlm}

ExternalHostname                   : mail.domain.com
InternalHostname                   : clippers.domain.local
ExternalClientAuthenticationMethod : Negotiate
InternalClientAuthenticationMethod : Negotiate
IISAuthenticationMethods           : {Negotiate}