How do I resolve issues with my search function not returning any results in Outlook for Exchange?

1. Check if Outlook is in Offline Mode by clicking the Send/Receive tab, and then clicking the Work Offline button so the dropdown arrow toggle is not enabled.
2. Verify that PST and OST files have not been marked as read-only files.
3. Verify that the Outlook Index is enabled and complete by clicking the Search Tools tab, and then choosing the Instant Search from the ribbon.
4. Check your Outlook account settings for POP or IMAP by going to the File tab, clicking Account Settings, and then Verify your account settings.