You may also want to create a shortcut to this file on your desktop for easier access. Outlook uses an .ost file only if the Exchange email account is configured to use Cached Exchange Mode. If Outlook is configured to connect to the Exchange mailbox in Online mode, an .ost file is not used. In Sync Window Settings, adjust the number of months of data that are synced for the primary shared calendars.
Yes, you can often fix Outlook without reinstalling Office. A damaged or corrupted Outlook user profile is a common reason for “Outlook won’t open” errors. Creating a fresh profile can provide a clean slate for Outlook to start. Outlook stores all your email messages, meetings and events, contacts, and tasks in data files.
Use the People page to find, view, create, and edit contacts and contact lists. To learn more about managing contacts in Outlook.com, go to Create, view, and edit contacts and contact lists in Outlook.com. At the top of the message list, you can choose how you want to view the list. There might also be a visual alert that a message is unread, has an Outlook not opening on Windows 10 attachment, or is flagged. To change your Mail settings so your inbox looks and behaves the way you want it to, see Personalize your new Mail experience in Outlook.com.
It will help pinpoint the troublesome add-in you can remove or replace. Sometimes, a weak or unstable internet connection can cause Outlook to misbehave. To check if this is the issue, temporarily disconnect from your Wi-Fi or unplug your LAN cable, and then try opening Outlook again. If you receive a connectivity error, your network might be to blame. You can also connect to a different Wi-Fi source to see if that resolves the problem.
Incorrect system date or time can prevent Outlook from loading profiles, especially in environments where authentication relies on accurate timestamps. Even a difference of one hour can block Outlook from starting. If I run an online repair and reboot her PC it Outlook not opening on Windows 10 will usually work for a day or two.
However, you might experience decreased performance as the number of items approaches 10,000 calendar items, 10,000 folders, or 100,000 mail items per folder. Large numbers of recurring meetings or long-lived recurring meetings can also have an exaggerated effect on performance. One-time meetings have a relatively small effect, and long-lived, recurring meetings have a greater effect. A change that’s made in an instance of a recurring meeting creates exceptions that are stored in the recurring meeting series. Every change to the meeting attributes, such as the subject, body, location, or time, creates a corresponding exception. Eventually, these exceptions inflate the size of the recurring meeting and impose Outlook not opening on Windows 10 a greater performance cost.
If you get the error “Cannot open the Outlook window” when trying to start Outlook, the error usually indicates that your Folder Pane or Navigation Pane settings holds a corruption. This guide explains all you need to know about that in order to get your Outlook to start without errors again. Microsoft says Office Outlook not opening on Windows 10 users may experience problems launching Outlook and other apps on Windows 10 and 11 due to conflicts with antivirus software after installing the latest Patch Tuesday update. I did every solution what was written in this community, but this didn’t resolve my issue.
For more information about when builds are available for their respective channels, go to Update history for Microsoft 365. We’re investigating the issue Outlook not opening on Windows 10 and will update this page when a fix is available. Set up your account manually as an IMAP or POP account in Outlook.
You can read how to fix your Outlook problem on the internet, but sometimes the suggestions don’t work for your specific case. So, we have produced this list of general things to try to resolve your problem in Outlook. Read on Outlook not opening on Windows 10 to find out how to fix common Outlook problems below. To get support in Outlook.com, click here or select Help on the menu bar and enter your query. If the self-help doesn’t solve your problem, scroll down to Still need help?
If you have Outlook in your startup folder, remove the shortcut from the startup folder. Use the classic Outlook for Windows connectivity troubleshooter to troubleshoot Outlook connectivity issues. If you can’t open Outlook, or Outlook disappears or crashes, one of your add-ins may be to blame or you may need to update Outlook. For contacts, you can select Filter in the upper right to select what to display in the list and how to sort. If you decide you don’t want the calendar you created, right-click the calendar and select Remove. Under Calendars, My calendar is the default selection and displays the calendar in Month view.
To sum up, we explored several methods to fix “Outlook won’t open” errors. Whether it’s a profile issue, a corrupted PST file, or faulty add-ins, the methods above can help you get Outlook running again. When Microsoft Outlook refuses to open, it’s incredibly frustrating. This issue often stems from common culprits like a corrupted user profile, a damaged data file (PST or OST), or even a minor conflict within its settings or add-ins.