Several weeks ago I updated from Outlook 2010 on my primary computer (Windows 8) to Outlook 2013 (Office 365). Previously, contacts and calendar were synchronized with my Windows Phone (7.5) via my Microsoft Account (Live.com, Hotmail.com, Outlook.com). During the first few weeks, all was fine until June 7, 2013, when I noticed that all my contacts in Outlook had been duplicated, but that is the only location showing duplicates. All is fine in the "cloud" and on my Windows phone. I deleted the Exchange ActiveSync account from Outlook to "reset the shot clock." When I reestablished the Exchange ActiveSync account, all was fine, no duplicates. An hour or so later, I checked and the contacts had been duplicated again. No problems with the calendar entries. So, what might be causing the contacts to be duplicated and how do I resolve the issue? Many thanks in advance for technical insight!