Hi IanMaddox,
I’ll answer your question in two assumption:
If you want to get a .csv copy of a user’s contact list in Exchange Online, please try the steps below:
- Connect Outlook to Exchange Online using the user’s account
- Click “File”-“Options”-“Advanced”, then click the “Export” button in the right panel
- Choose “Export to a file” in the pop up window, click “Next”, then choose “Comma Separated Values(Windows)” and click “Next”. Select the “Contacts” tab and click “Next”, choose a location that you want save the file in and click “Next”, click “Finish” to start the process.
- You’ll get the excel file in the location you’ve just chose.
If you want to get a list of the “External Contact” in your organization in Exchange Online, you can use PowerShell to export a list of contact to a .csv file, to do that, please try the steps below:
- Configure PowerShell for Office 365
- Connect PowerShell to Exchange Online(with the admin’s credential)
- Type in “Get-MailContact | Export-CSV C:\test.csv” in PowerShell
- You’ll then get a list of the external contact in the file