How can I extract O365 email addresses from Outlook

If you use Microsoft 365 (O365) and Outlook regularly, you may need to extract all email addresses from your mailbox for backup, migration, or contact management. Outlook lets you export mailbox data, including email addresses, with a few simple methods.
The easiest approach is to use the built-in Export feature in Outlook. Go to File > Open & Export > Import/Export, select Export to a file, and choose Comma Separated Values (CSV). When you export your Contacts folder, Outlook saves all the contact email addresses in a CSV file that you can open in Excel.
If you want to extract addresses from emails (not saved contacts), you can use the Search Folder and copy all message headers, then use Excel or a scripting tool like PowerShell to extract unique addresses. For Microsoft 365 admins, PowerShell provides a faster option using the Get-Mailbox or Get-Mail Contact commands to list all users’ email IDs.
This process helps you maintain an updated contact list, prepare for migrations, or perform email marketing tasks efficiently while ensuring data consistency across platforms.
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