cannot open my outlook

Question

cannot open my outlook, can anyone suggest a solution.

Answer 1

Try these steps in order until Outlook opens again:

1. Run the /resetnavpane command
   1. Close Outlook completely.
   2. Press Windows + R to open Run.
   3. In Open, type:

            Outlook.exe /resetnavpane
      

   4. Select OK and then try to start Outlook normally.
2. Start Outlook in safe mode and disable add-ins
   1. Press Windows + R.
   2. Type:

            outlook.exe /safe
      

      and select OK.
   3. If Outlook opens, go to File > Options > Add-ins.
   4. At the bottom, next to Manage, choose COM Add-ins and select Go.
   5. Clear the check box for every add-in to disable them, then select OK.
   6. Close Outlook (File > Exit), then open Outlook normally.
   7. If it now works, re‑enable add-ins one at a time, restarting Outlook each time, to find which add-in causes the problem. Leave the problematic add-in disabled.
3. Create a new Outlook profile
   1. Follow the steps in Create an Outlook profile to create a new profile.
   2. Restart Outlook.
   3. In the Choose Profile dialog, select the new profile and choose OK.
   4. If Outlook starts normally with the new profile, the old profile is corrupted. Before removing the old profile, back up any Outlook Data Files (.pst/.ost) as removing a profile deletes offline cached content.
4. Repair Outlook data files
   1. Close Outlook.
   2. Run the Inbox Repair Tool (scanpst.exe) as described in Repair Outlook Data Files (.pst and .ost) to scan and repair the data file used by the profile.
   3. After repair completes, start Outlook again.

If Outlook still will not open after all of these steps, reinstalling Office 365 from the subscription has resolved similar issues for other users.

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References:

• I can’t start Microsoft Outlook or receive the error “Cannot start Microsoft Outlook. Cannot open the Outlook Window”
• What to do when Outlook will not open on my PC? - Microsoft Q&A