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How collect ActiveSync device logs by using Outlook Web App to troubleshoot sync issues between mobile devices and Exchange Online Preview
http://support.microsoft.com/kb/2727817/en-us?sd=rss&spid=15834&utm_source=twitterfeed&utm_medium=twitter
Describes how to use Outlook Web App to collect ActiveSync device logs to help troubleshoot issues in which you can’t sync mobile devices to Exchange Online Preview.