- There are duplicate contacts in the contact list.
- The contacts contain incorrect information.
- You can't remove contacts from Lync, Outlook 2013, or Outlook Web App.
- Outlook 2013 slows down when it resolves contacts or opens contact cards.
- Install the latest Lync 2013 (15.0.4517.1005 or newer) or Lync 2010 (4.0.7577.4419 or newer) update. To do this, go to one of the following Microsoft Knowledge Base articles:
- Contact Microsoft Customer Support Services to obtain a tool that will remove the duplicate contacts.
Article ID: 2916650 - Last Review: 28 Dec 2016 - Revision: 1