The Import-ContactList cmdlet submits a request to import a list of mail contacts that are contained in a .csv file to a cloud-based mailbox. Many MAPI and Web-based email clients allow users to export contacts to a Microsoft Office Outlook .csv format. Users can then provide that .csv file to you to import contacts to their cloud-based mailbox. During the import process, Microsoft Exchange matches the column names in the header row of the .csv file to the property names of an Exchange contact. You need to be assigned permissions before you can run this cmdlet. Although this topic lists all parameters for the cmdlet, you may not have access to some parameters if they're not included in the permissions assigned to you. To find the permissions required to run any cmdlet or parameter in your organization, see Find the permissions required to run any Exchange cmdlet.

Learn how admins can use Exchange Online PowerShell and a CSV file to bulk import external contacts to the global address list.