Tip: If your Outlook Data File (.pst) becomes large it can slow down your OneDrive sync and may show 'Processing changes' or 'A file is in use'. Learn How to remove an Outlook .pst data file from OneDrive.
When you add an email account to Outlook, a local copy of your information is stored on your computer. 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 Outlook Data Files (.pst files). Outlook 365 accounts, Exchange accounts, IMAP accounts, and Outlook.com accounts store their information in Offline Outlook Data Files (.ost files). Outlook Data File (.pst)An Outlook Data File (.pst) contains your messages and other Outlook items and is saved on your computer. POP accounts—which is a common type of account you can create when adding an email account from an internet service provider (ISP) like Xfinity or AT&T or Cox—download all of your email messages from your mail server and save them on your computer. Note: In Outlook 2013 and earlier versions, IMAP accounts also used an Outlook Data File (.pst). In Outlook 2016 and Outlook for Office 365, IMAP accounts use Offline Outlook Data Files (.ost). You can also use an Outlook Data File (.pst) to backup or export items from any type of email account. For more information on backing up your email messages, calendar, contact, and task data, see Export or backup email, contacts, and calendar to an Outlook .pst file. Autodesk autocad 2016 free download. You can also import email messages, calendar, contact, and task data from another Outlook Data File (.pst). For more information about importing items, see Import email, contacts, and calendar from an Outlook .pst file. Note: You cannot import from an Offline Outlook Data File (.ost) file. Because these files are saved on your computer, they aren’t subject to mailbox size limits on a mail server. By moving items to an Outlook Data File (.pst) on your computer, you can free up storage space in the mailbox on your mail server. When messages or other Outlook items are saved in an Outlook Data File (.pst), the items are available only on the computer where the file is saved. Offline Outlook Data File (.ost)Most other account types, such as IMAP accounts, Office 365 accounts, Exchange accounts, and Outlook.com accounts use an Offline Outlook Data File (.ost) file to store a synchronized copy of your mailbox information on your local computer. When your connection to the mail server is interrupted, for example, when you're on an airplane without WiFi or if your internet connection disconnects, you can still access all emails, calendar data, contacts, and tasks that have been previously downloaded. You can read and compose messages, create appointments, and add contacts. However, your email messages won't be sent and no new messages will be downloaded until your internet connection is restored. When the connection is restored, changes are automatically synchronized, and the folders and items on the server and on your computer are identical again. File locationsThe fastest way to open the folder where your Outlook Data Files (.pst and .ost) are saved is to do the following:
Outlook Data Files (.pst) created by using Outlook 2013 or Outlook 2016 are typically saved on your computer in the DocumentsOutlook Files folder. If you upgraded to Outlook on a computer that already had data files that were created in Microsoft Office Outlook 2007 or earlier, these files are saved in a different location in a hidden folder at drive:UsersuserAppDataLocalMicrosoftOutlook. The offline Outlook Data File (.ost) is also saved at drive:UsersuserAppDataLocalMicrosoftOutlook. Most data remains on the server; however, any items that are saved locally should be backed up. For example, Calendar, Contacts, Tasks, and any folders marked Local only.
Tip: For information about hidden folders in Windows, see Windows Help and Support.
Related TopicsCreate an Outlook Data File (.pst) to save your information You can use the Inbox Repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file. The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape. You might want to use the Inbox Repair tool in the following situations:
If you're using an Exchange email account, you can delete the offline Outlook Data File (.ost) and Outlook will recreate the offline Outlook Data File (.ost) the next time you open Outlook.
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Repair an Outlook data file (.pst) file
![]() What happens after you repair an Outlook Data File? In the Folder Pane, you might see a folder named Recovered Personal Folders that contains your default Outlook folders or a Lost and Found folder. Although the repair process might recreate some of the folders, they may be empty. The Lost and Found folder contains any folders and items recovered by the repair tool that Outlook can't place in their original structure. Create new data file You can create a new Outlook Data File and drag the items in the Lost and Found folder into the new data file. After you've moved all the items, you can remove the Recovered Personal Folders (.pst) file, including the Lost and Found folder. To create a new Outlook Data File, see Create an Outlook Data File. Recover items from the backup (.bak) file If you can open the original Outlook Data File, you might be able to recover additional items. The Inbox Repair tool creates a backup file with the same name as the original, but with a .bak extension, and saves it in the same folder. There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't.
Locating the Outlook Data FilesYou can check the location of your Outlook Data Files in Outlook.
You can use the Inbox Repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file. The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape. You might want to use the Inbox Repair tool in the following situations:
If you're using an Exchange email account, you can delete the offline Outlook Data File (.ost) and Outlook will recreate the offline Outlook Data File (.ost) the next time you open Outlook.
Notes:
Reinstall Outlook 2013
Repair an Outlook data file (.pst) file
What happens after you repair an Outlook Data File? In the Folder Pane, you might see a folder named Recovered Personal Folders that contains your default Outlook folders or a Lost and Found folder. Although the repair process might recreate some of the folders, they may be empty. The Lost and Found folder contains any folders and items recovered by the repair tool that Outlook can't place in their original structure. Create new data file You can create a new Outlook Data File and drag the items in the Lost and Found folder into the new data file. After you've moved all the items, you can remove the Recovered Personal Folders (.pst) file, including the Lost and Found folder. To create a new Outlook Data File, see Create an Outlook Data File. Recover items from the backup (.bak) file If you can open the original Outlook Data File, you might be able to recover additional items. The Inbox Repair tool creates a backup file with the same name as the original, but with a .bak extension, and saves it in the same folder. There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't.
Locating the Outlook Data FilesYou can check the location of your Outlook Data Files in Outlook.
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