To bulk delete emails in Microsoft Office Outlook, you can follow these steps:
1. Open Outlook and go to the folder where the emails you want to delete are located.
2. Click the checkbox next to the first email you want to delete. This will select that email.
3. Hold down the Shift key on your keyboard and click the checkbox next to the last email you want to delete. This will select all of the emails in between the first and last email you clicked.
4. With all of the desired emails selected, right-click on one of them and choose "Delete" from the context menu.
5. A confirmation dialog box will appear asking if you're sure you want to delete the selected emails. Click "Yes" to confirm.
Alternatively, you can use the keyboard shortcut of "Ctrl + A" to select all emails in the folder, and then follow the same steps to delete them in bulk.