To delete contacts from Outlook, you will need to open your address book and select the entries you want to remove before clicking delete.

Microsoft Office Outlook maintains everything in a data file, also called PST or OST file. It is an offline copy of mailbox data stored on a local PC. In case of issues, you must delete the data file ...

If you are unable to delete emails or folders in the Outlook application, here are some fixes that can solve the issue: Edit, Save, and Delete the Email Hard Delete Emails or Folders Empty Deleted ...