There are a number of reasons why your Outlook showing error, Sometime Outlook isn't sending mail, sometime it isn't receiving mail that spoil the user experience. Here is a list of the common issues of Microsoft Outlook:
- Outlook Send/Receive Error
- Cannot Open Outlook Window
- Increasing PST File Size
- Slowdown by Add-in Applications
- Outlook Crashes Frequently
Most of the Outlook errors can be resolved just by restarting your system/Outlook, checking account settings, using scan PST, etc. Below are some methods for users to resolve common Outlook errors:
- Check Internet Connectivity
- Check the Antivirus Settings
- Clear or Move Email from Outlook Folder
- Reinstall Outlook
- Avoid Accessing Suspicious Emails
- Change the Server Time-Out Settings
- Rectify PST Corruption
You can refer this link: https://social.technet.microsoft.com/Forums/en-US/b219b004-e8f6-448c-bc26-59887e375e93/outlook-does-not-open-pst-files?forum=outlook
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