If you cannot open your Outlook data file or suspect that the file is damaged, use the Inbox Repair tool (scanpst.exe) to repair errors in the file.

Learn how to find out the size of your mailbox and its folders and how to compact Outlook Data Files (.pst and .ost), which might help improve performance.

How to start Office for Windows applications in Office Safe Mode. Use one of these methods to start an Office application in Office Safe Mode on a Windows PC: Press and hold the CTRL key to open an Office application. Use the /safe option to open an Office application.

Install Microsoft 365 2019 or 2016 on a PC. Remember a one-time purchase version of Microsoft 365 is licensed for one install only. Depending on your browser, select Open file (in Edge or Internet Explorer), Setup (in Chrome), or Save File (in Firefox).

This feature allows you to access your previously downloaded or synchronized email messages, calendar information, contacts, and tasks without an internet connection. Certain types of accounts, such as POP accounts, store their information in the Outlook Data File (.pst) format.

If you use a POP or IMAP account, then all of your Outlook information is stored in an Outlook data file, also known as a Personal Folders File (.pst). You might also use an Outlook data file to backup messages or store older items to keep the size of your mailbox small.

For POP and IMAP accounts, you might store your Outlook items in an Outlook Data File (.pst). If you want to open or close an Outlook Data File (.pst), you can do that in a few simple steps.

Create Outlook Data Files (.pst) on your computer to save Outlook items by account, project, or to archive older items.

Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows 8.1, Windows 8, Windows 7 or Windows Vista.

Steps: Import Outlook items from a .pst file in Outlook for PC. These instructions assume you've already exported your Outlook email, contacts, and calendar from another instance of Outlook, and now you want to import them to Outlook. At the top of your Outlook ribbon, select File.