If you have an Office 365 mailbox, you can access it over the Internet, just like you sign in to Facebook, Gmail, or Amazon. It looks like this:
To import your contacts to your Office 365 mailbox, you need to use Outlook 2016, 2013, 2010, or 2007. When you launch Outlook, you'll see "File" in the top left corner:
To import contacts to your Office 365 email account:
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Export your contacts from your "source" email service:
Most email services export contacts in CSV format. See the instructions for your email service: Gmail, Outlook.com/Hotmail, iCloud, Yahoo, Mozilla. Or, go the web site for your email service for instructions.
If you've added your source email account to Outlook, you can use Outlook to export contacts in CSV or .pst format.
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Add your Office 365 email account to Outlook.
Outlook will sync with your Office 365 mailbox. After a while, you'll see a copy of your email and contacts in Outlook.
Use the import instructions on this page for Outlook 2016, 2013, or 2010 to import a CSV file or .pst file that has your contacts.
If you don't have Outlook installed on your computer, see How to get Outlook for your desktop.