Step 1: Open the Microsoft Outlook application.
Step 2: Go to File tab. Click on Account Settings>>Account Settings.
Step 3: Under Emails tab, select your account name and then click on Remove option.
Step 4: Close and open the Outlook application again.
Step 5: Go to File tab. Click on Account Settings>>Account Settings.
Step 6: Click on Add Account option and enter your IMAP account login details and incoming and outgoing server correctly.
Step 7: Click Next.
Step 8: Switch to Send/Receive tab and click the send/receive button.