I have a very simple environment. 3 new Exchange 2013 servers in a DAG behind a load balancer. Most users are still on Exchange 2007 environment. Autodiscover has been configured for load balanced name. There is no External Outlook Anywhere connectivity. I have NOT enabled Outlook Anywhere in the 2007 environment. I have a simple Lync 2013 environment. 1 Server in a standard pool with no external connectivity. I have integration with OWA 2013 and Lync working. All versions of Outlook are at least on the patch level required for Exchange 2013.
My issue is random password prompts in Outlook for some (not all) users with mailboxes on Exchange 2013. This password prompt appears to be coming from the load balanced Outlook anywhere name. I have had a few reports of users on Exchange 2007 getting an error stating they cannot open default set of folders. If I have them exit Lync 2013 client and open Outlook again it works fine. They can then open Lync without issue. Closing and opening Outlook will no longer reproduce the issue. It seems like Lync is causing an issue here somewhere, but I have no idea where.
Lync BPA completes without any warning or errors. All test cmdlets complete without any errors.
2013 Outlook Anywhere settings:
Name : Rpc (Default Web Site)
ExternalHostname :
InternalHostname : mail.company.com
ExternalClientAuthenticationMethod : Ntlm
InternalClientAuthenticationMethod : Ntlm
IISAuthenticationMethods : {Basic, Ntlm, Negotiate}
Get-AutodiscoverVirtualDirectory|select *auth*
InternalAuthenticationMethods : {Basic, Ntlm, WindowsIntegrated, WSSecurity, OAuth}
ExternalAuthenticationMethods : {Basic, Ntlm, WindowsIntegrated, WSSecurity, OAuth}
LiveIdNegotiateAuthentication : False
WSSecurityAuthentication : True
LiveIdBasicAuthentication : False
BasicAuthentication : True
DigestAuthentication : False
WindowsAuthentication : True
OAuthAuthentication : True
AdfsAuthentication :
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