How To Fix Outlook Not Working.
1. Check For Unattended Dialog Box. Check if any Dialog box related to Outlook is open in the background. It sometimes may happen that you miss ...
2. Check For Ongoing Process.
3. Starting Outlook In Safe Mode.
4. Disable Outlook Add Ins.
5. Update Windows.

Why is outlook not responding?
Some of the common causes of “Outlook Not Responding” error are mentioned below. The Outlook is outdated. The Outlook is being used by multiple processes. Conflict in the add-in installed with Outlook. Heavy mailbox. Any sort of corruption in Office programs. Corrupt or damaged Outlook data files.

Why is Microsoft Outlook not responding?
Microsoft Outlook Is Not Working

Close all programs and restart your computer.
Check that your anti-virus programs aren't currently scanning your computer.
Restore your computer to an earlier date when you were able to open Outlook.
Make sure your computer is connected to the Internet if you're unable to send and receive emails.

Why wont outlook responding?
A lagging or inaccessible Outlook is a typical problem for most users. Usually the inaccessibility of Outlook stems from a corrupt or damaged application file; certain files prevent Outlook from opening. Fortunately, fixing an unresponsive Outlook program doesn't require much work or knowledge.