5 Years ago I migrated our organization from Ex2003 to Ex2007. The last Ex2003 server was removed as per Microsoft procedures. Over this period of time users will be prompted for credentials when opening Outlook. This behavior does not occur all of the time which makes this all the more puzzling. I use Outlook 2013 and am prompted all of the time. The remainder of the company uses Outlook 2007 where the prompting occurs sporadically. What am I overlooking?
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