When You pick the Microsoft Outlook program from the Start menu or a shortcut icon, but Outlook won't open, the right fix depends on what you experience as well as the version of Microsoft Outlook that's installed.

Why Won't Outlook Open And How To Repair

If You use Outlook on a Windows computer and Outlook does not open or opens with problems, try these troubleshooting steps in the order presented here, from easy to more complicated. If you use the cloud-based Microsoft 365 on a PC or a Mac, the automated Support and Recovery Assistant tool can diagnose and fix many problems, including the problem of Microsoft Outlook Won't Open. I personally try these methods when My Outlook Won't Open therefore am sharing here these fixes in this blog.

1. Open Outlook- Sometimes Outlook Won't Open in Safe Mode If Outlook opens as expected in Safe Mode, the issue is probably an add-in or toolbar extension.

2. Disable add-ins.- Conflicting with Outlook and cause the problem. Disable all add-ins and see if this resolves the problem.

• Select File > Alternatives > Add-ins.

• In the Manage section, Select Go.

• Clear the check boxes next to the add-ins you want to disable.

3. Repair Outlook(Outlook Won't Open ).- The Outlook application may be damaged. Use the built-in Microsoft Office repair utility to fix it.

4. From the Programs segment, select Uninstall a Program.

5. Right-click Microsoft Office and

6. Select Online Repair or Repair. Pick Yes if a user account control prompt appears.

7. Repair your Outlook profile. Outlook profiles Can become corrupted, causing a number of issues, including Outlook not opening.

8. If Outlook still Doesn't open, use the Inbox Repair tool to find and possibly fix the problem.

• Exit Outlook.

• Download and open the Inbox Repair Tool from Microsoft.

• Select Browse and browse to Your own folders (.pst) file, then choose Start.

• Pick Repair if the scan finds errors.

9. Reset the navigation pane. A startup issue Using the navigation pane can prevent Outlook from opening correctly. Resetting the navigation pane may resolve the issue.

• Exit Outlook.

• reset nav pane and select OK.

• Open Outlook. The navigation pane will be reset.

Microsoft Outlook continues To be the preferred email client for most organizations due to its impressive features such as intuitive user interface (UI), a wide assortment of add-ons, option to add contacts & create tasks, and a lot more. But this popular email client is also prone to errors and issues. Sometimes, you encounter a situation when your Microsoft Outlook will not open or begin and returns an error message that reads:

"Can't start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. The operation failed."

I do a little bit of research on this problem then I get some reasons that Why Won't My Outlook Open Following are some reasons that may cause Microsoft Outlook Email Won't Open :

If Outlook Won't Open Links you may try the following steps:

• Outlook PST file is accidentally deleted or damaged

• Incorrect configuration of the application

• Improper installation of the application

• Virus or malware infection

• Installation of conflicting add-ins

Causes: The most common reasons for Facing such undesirable error message are:

1. When a user is restricted to access temporary Internet files and folders on the local system or the server. The Subfolder, which contains default copies of temporary Internet files, has reached its storage limit.

2. Outlook denies permission to get suspicious attachments due to the default security protocols, which may damage the user's Outlook database or other system documents severely. Therefore, Outlook Won't Open Attachments, displaying either of the above-displayed errors.

3. When a user tries to open Outlook attachments while Outlook PST files are in a corrupt or inaccessible state

4. When an individual repetitively access the exact same Outlook attachment(s). In cases like this, multiple temporary files carrying the identical filename are made in the Temporary document folder. After a certain period, Outlook denies saving temporary files of the exact same filename at the temporary location.

5. Office 365 Won't Open When a user Using Outlook Web App, Outlook Web Program blocks attachments with some specific file extensions.

Outlook Won't Open in Windows 10 | Try These solutions

Solution I: When the cause of the Error is connected with Temporary Internet folders:

Step 1. Click Start, hunt, and select the Run option.

Step 2. Click Edit and then select for the Find option.

Step 3. Type OutlookSecureTempFolder from the Find dialog box and then click on the Find Next Choice.

Step 4. Locate the registry key that comprises the actual folder place. It may appear like:

Step 5. Now, note down the folder's location by double-clicking the essential name on the right panel.

Step 6. Go to the Run window and then type the particular location and click on OK.

Step 7. The folder will be automatically opened by the default browser.

Step 8. Eliminate all of the files within the folder.

Step 9. Restart your browser and try opening the Outlook attachments, which you're unable to access.

Note: Disabling Outlook Add-ins ought to be attempted as outside Add-ins can be accountable for the inaccessibility of Outlook attachments.

Try Another Solution If Outlook Email Won't Open

Solution II: When the cause of the error is associated with default security protocols:

If the mistakes are the result of Security restrictions, then the user must edit and edit the security settings from the Outlook registry. Now, the modification of security registry keys is contingent on the MS Windows version. Have a look at the measures to alter these keys version-wise provided by Microsoft recovery specialists. Here we have described steps for the earliest and the latest versions of Windows OS: For the earliest variant, Window XP:

1. Click Start, search, and select the Run option.

2. Type the following command and then click OK.

3. Select Create a restore point and click Next.

4. A new webpage will start, here mention the brand new file recovery place, and then click produce and then click the Close button.

5. Again, repeat steps 1, 2, and 3.

6. Select Restore my computer to an earlier time choice and click on Next.

7. When the new page appears, select the system checkpoint.

8. A System recovery message will prompt, listing configuration changes made, click OK.

After this, the problem of Microsoft Outlook 2010 Won't Open may be solved.

Follow the Steps If Outlook Won't Open on Mac :

• Click Start, hunt, and select the Run option. Type REGEDIT.EXE

• Mention government password if password verification is prompted.

• After opening Registry Editor, follow the registry key which you want to modify.

• Currently, Click on the File menu and then select Export.

• The Export Registry File box may appear, mention where you would like to restore the copy name of the backup file to spot it afterward, and Click Save.

If Outlook 2016 Won't Open In Windows 10 Try The Solution Given Below

Solution III: When Outlook Internet Program doesn't open attachments

Outlook Web Application can Limit the download of documents with some specific extensions. We can change the policy settings to permit the necessary file types. If You're facing difficulties while Downloading files of certain extensions using the Outlook Web program, you can get rid of a file extension in the obstructed application list and insert it into allowed lists. After you try these steps you can solve Windows 10 Outlook Won't Open.

In this Site, we discussed the problems faced by users while accessing or downloading Attachments with Outlook. We discussed various causes behind the problem and The answers based on these causes. We supplied step-by-step instructions for Each of the fixes. If, you are still Unable to get rid of the error, you Want To repair your corrupt PST. Do not worry, we will Supply you the best answer For this as well. Download and install the Kernel to Outlook PST Repair tool and fix your PST by following simple on-screen measures.

Occasionally you might find that Outlook 2007 won’t open – this isn’t unusual and might be due to a number of factors, which include:

• A corrupt installation

• Conflicting Outlook add-ins

• An incorrect desktop shortcut

Often these issues occur in Microsoft Vista, but are just as likely to affect users of Windows XP and Windows 7.

A number of manual fixes (outlined below) can be performed if you cannot start Microsoft Office Outlook. Some alternatives can be found in the article Troubleshooting Outlook - Outlook 2007 is Not Responding.

If Outlook 2010 Won't Open you may try the following Steps

• Reinstalled the entire Office package several times - incl. shifted drive

• Repaired the Office installation several times

• Removed/uninstalled all Add Ins

• Deleted the profile in the registry

Mails can be created using the link, and by clicking the "new mail alert" I can even read and reply to e-mails. All other Office products works as a clock. But the Outlook Inbox is not showing/coming starting as described in the quote. Try the same thing if your Outlook 2013 Won't Open.