Today all of our outlook 2010 and 2007 clients are repeatedly getting asked for their password. This problem just appeared today at both of our locations with exchange 2010 server.

Users on the local network can open outlook and it immediately connects and they see their e-mail.  After a minute or two a box will popup asking for their password.    Even if it is entered correctly it keeps asking over and over.  Closing
outlook and re-opening it solves the problem but only for a minute.   Remote users using HTTPS over OWA to connect can't get their outlook clients to connect at all.   This does not have any effect on ios devices just outlook 2010 and older.  

I would suggest that some virtual directories configured to use Basic Authentication. EWS, OAB or Autodiscover for instance.
Also check Outlook Anywhere configuration. If it was changed from NTLM to Basic it could cause such credential's prompts.
But if you believe that configuration wasn't changed recently then another possible reason for this behavior could be NTLM bottleneck:
http://blogs.technet.com/b/get-exchangehelp/archive/2013/01/31/the-curious-case-of-maxconcurrentapi.aspx
http://blogs.technet.com/b/askds/archive/2011/09/15/is-this-horse-dead-yet-ntlm-bottlenecks-and-the-rpc-runtime.aspx
HTH

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