Hey I'm Michael and I work for connex.io, an address book service. To my knowledge, there is no option to do this in Outlook itself. Depending on the service you use, there might be a de-duplication feature available. If you want, you can try connex.io.
Our app can automatically de-duplicate, complete and clean your contacts for you and sync them with many devices (including Outlook). If you want to check it out: or if you need more help you can mail me:. Michael 'I may receive some form of compensation, financial or otherwise, from my recommendation or link.' Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums.
After installing the app to delete duplicate contacts, you need to run it and sync with OS X Contacts. This app will ask you to allow it to access your Contacts,click “OK”, your Contacts will be synced successfully. Update new information from a duplicate contact to an existing one Outlook will compare all the fields that contain data in both the duplicate and existing contacts and copy the data from the duplicate contact into any fields in the existing contact that have conflicting data.
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There are a few ways to go about this. First, you can sync with the OS X Contacts app and look for duplicates manually, which is a pain.
Second, you can export your contact lists from other services, choose the one you want to sync with, and import them there, clearing duplicates manually as you go and only leaving the one service on. The easiest way would be to use a service like Scrubly, which can take multiple address books into it, merge all the duplicates, add social media info, and give you a clean contacts list that you can use.
Doing it this way you would merge all your duplicates with Scrubly, then delete all your contacts from every service you just merged, and import the one clean file. Your contacts are backed up in case you're not happy with the results, and you're done. Whole process should take less than 30 minutes, and you don't need to be there for most of it. Here's more info on the Scrubly approach, and there's posts on their blog about how to do this for each service you've got.