How to import Office 365 Contacts to Outlook

Export the contacts from your other email account to a .csv file. Instructions for exporting your contacts from a variety of email clients are available here. Note where you save the .csv file.
Start Outlook.

1. Click the File tab.
2. Click Open & Export.
3. Click Import/Export.
4. Click Import from another program or file, and then click Next.
5. Under Select the file type to import, click Comma separated values, and then click Next.

The most common is Comma Separated Values (Windows), also known as a CSV file. If you are importing contacts that were exported from Outlook to an Outlook Data File (.pst), click Outlook Data File (.pst).

6. Under File to import, click Browse, select the file that you want to import, and then click OK
7. In the Import a File dialog box, under Options, click one of the following:

a. Replace duplicates with items imported – If an Outlook contact already exists, it is replaced by the information that you are importing.

b. Allow duplicates to be created – If an Outlook contact exists, the imported contact is created as a second contact.

c. Do not import duplicate items – If an Outlook contact exists, the information for the imported contact is not imported.

8. Click Next.
9. In the Import a File dialog box, under Select destination folder, click a folder for the imported contacts, and then click Next.
10. This usually is the Contacts folder unless you have multiple accounts, or have created multiple contact folders for an account.
11. If your contacts were exported from Outlook, click Finish.