After PST/OST file is created in Outlook, it would save in default location on your computer. When you run Microsoft Outlook, the PST/OST file would open in Outlook automatically.
However, if the PST/OST file has been moved from default location to another folder, it would not be open until you navigate to the folder and choose it. In following article, you could learn how to change .PST or .OST file default location if you like.
Why we need to change Outlook data file (.pst, .ost) location?
  1. In Outlook previous version, the outlook data file (.pst) is created and saved in hidden folder. So generally, you cannot see and back up it easily. In order to make back up easier, move Outlook data file from default location to another folder is necessary.
  2. In Outlook latest version, the Outlook data file has been saved in DocumentsOutlook Files automatically while you created it. But if you don’t like it save in this location or you don’t expect it occupying system drive, you can move it to another folder in other hard drive.

How to Change Outlook Data File (.pst) default location?

This article takes Outlooks 2010 to show how you can move Outlook data file (.pst) to different folder.
1. Save items in Outlook 2010 and exit.
2. Open Windows Explorer and move the outlook data file (.pst) to new location.
3. Restart Outlook.
4. An error dialog box appears that notified an Outlook data file could not be found.
5. Click OK.
6. In the “Create/Open Outlook Data File” dialog box, browse to the new location, and select the outlook data file (.pst) you moved. And then click Open.
From then on, the Outlook data file (.pst) will save in this new location, if you don’t change its location later.

How to Change Outlook .OST File Default Location

Tips: Please change the .OST file default location before you add email account to Outlook. The article below will show you how to change .OST file default location in Registry Editor.
Step 1: Press WIN + R to open Run box, and type regedit. Press Enter to open Registry Editor.
Step 2: Navigate to HKEY_CURRENT_USERSoftwareMicrosoftOffice15.0Outlook.
Step 3: Right click on the blank space in the right pane. Select New > Expandable String Value. Name it “ForceOSTPath“.
Step 4: Double-click the new key ForceOSTPath. When Edit String dialog appears, type the path in Value data and click OK.
After creating new string and set value data, open Outlook and add email account, you would find data file has been saved in the location you set, not default location.
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Hoping to be useful, I’m setting up a public list of all the installation paths of the various versions of Office (from XP to 2016) for all Windows systems.

Installation Paths

All the applications provided by the Office suite (Word, Excel, Outlook, Access, Powerpoint), if installed, can be found within the given folder(s). The executable files have kept the same names since Office XP, which are the following:

Where Is My Outlook Email Account

  • Word:
    WINWORD.EXE
  • Excel:
    EXCEL.EXE
  • PowerPoint:
    POWERPNT.EXE
  • Access:
    MSACCESS.EXE
  • Outlook:
    OUTLOOK.EXE
  • Visio:
    VISIO.EXE
  • Project:
    WINPROJ.EXE

Office XP

  • Windows 64-bit:
    C:ProgramFilesMicrosoftOfficeOffice10
  • Windows 32-bit:
    C:ProgramFiles(x86)MicrosoftOfficeOffice10

Office 2003

  • Windows 64-bit:
    C:ProgramFilesMicrosoftOfficeOffice11
  • Windows 32-bit:
    C:ProgramFiles(x86)MicrosoftOfficeOffice11

Office 2007

  • Windows 64-bit:
    C:ProgramFilesMicrosoftOfficeOffice12
  • Windows 32-bit:
    C:ProgramFiles(x86)MicrosoftOfficeOffice12

Office 2010

  • Windows 64-bit:
    C:ProgramFilesMicrosoftOfficeOffice14
  • Windows 32-bit:
    C:ProgramFiles(x86)MicrosoftOfficeOffice14

Click-To-Run

  • Windows 64-bit:
    C:ProgramFilesMicrosoftOffice14ClientX64RootOffice14
  • Windows 32-bit:
    C:ProgramFiles(x86)MicrosoftOffice14ClientX86RootOffice14

Office 2013

  • Windows 64-bit:
    C:ProgramFilesMicrosoftOfficeOffice15
  • Windows 32-bit:
    C:ProgramFiles(x86)MicrosoftOfficeOffice15

Click-To-Run

  • Windows 64-bit:
    C:ProgramFilesMicrosoftOffice15ClientX64RootOffice15
  • Windows 32-bit:
    C:ProgramFiles(x86)MicrosoftOffice15ClientX86RootOffice15

Office 2016

  • Windows 64-bit:
    C:ProgramFilesMicrosoftOfficeOffice16
  • Windows 32-bit:
    C:ProgramFiles(x86)MicrosoftOfficeOffice16

Click-To-Run

  • Windows 64-bit:
    C:ProgramFilesMicrosoftOffice16ClientX64RootOffice16
  • Windows 32-bit:
    C:ProgramFiles(x86)MicrosoftOffice16ClientX86RootOffice16
If you never heard of Click-To-Run installation mode, read here.

GUID

Download autodesk autocad 2018 for free. In case you also need the installation GUIDs, for example to retrieve some Office-related installation data from Windows Installer and/or Registry Editor, I’m also enumerating those (source: https://support.microsoft.com/en-us/kb/234788):

Office XP

  • Word: {8E46FEFA-D973-6294-B305-E968CEDFFCB9}
  • Excel: {5572D282-F5E5-11D3-A8E8-0060083FD8D3}
  • PowerPoint: {FC780C4C-F066-40E0-B720-DA0F779B81A9}
  • Access: {CC29E967-7BC2-11D1-A921-00A0C91E2AA3}
  • Office: {20280409-6000-11D3-8CFE-0050048383C9}

Office 2003

  • Word: {1EBDE4BC-9A51-4630-B541-2561FA45CCC5}
  • Excel: {A2B280D4-20FB-4720-99F7-40C09FBCE10A}
  • PowerPoint: {C86C0B92-63C0-4E35-8605-281275C21F97}
  • Access: {F2D782F8-6B14-4FA4-8FBA-565CDDB9B2A8}
  • Office: {90110409-6000-11D3-8CFE-0150048383C9}

Office 2007

  • Word: {0638C49D-BB8B-4CD1-B191-051E8F325736}
  • Excel: {0638C49D-BB8B-4CD1-B191-052E8F325736}
  • PowerPoint: {0638C49D-BB8B-4CD1-B191-053E8F325736}
  • Access: {0638C49D-BB8B-4CD1-B191-054E8F325736}
  • Office: {0638C49D-BB8B-4CD1-B191-050E8F325736}

Office 2010

32-bit

  • Word: {019C826E-445A-4649-A5B0-0BF08FCC4EEE}
  • Excel: {538F6C89-2AD5-4006-8154-C6670774E980}
  • PowerPoint: {E72E0D20-0D63-438B-BC71-92AB9F9E8B54}
  • Access: {AE393348-E564-4894-B8C5-EBBC5E72EFC6}
  • Office: {398E906A-826B-48DD-9791-549C649CACE5}

64-bit

  • Word: {C0AC079D-A84B-4CBD-8DBA-F1BB44146899}
  • Excel: {8B1BF0B4-A1CA-4656-AA46-D11C50BC55A4}
  • PowerPoint: {EE8D8E0A-D905-401D-9BC3-0D20156D5E30}
  • Access: {02F5CBEC-E7B5-4FC1-BD72-6043152BD1D4}
  • Office: {E6AC97ED-6651-4C00-A8FE-790DB0485859}
That’s it for now. If you have other PATH and/or GUID that you would like to add to this list, write a comment about it and I’ll update the post.

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. Autocad 2010 product key codes. 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.

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.

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. 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.

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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 locations

The fastest way to open the folder where your Outlook Data Files (.pst and .ost) are saved is to do the following:

  1. In Outlook, click the File tab.
  2. In right pane, click Account Settings, and then click Account Settings.
  3. On the Data Files tab, click an entry, and then click Open Folder Location.

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.

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.
Outlook 2016 data file location windows 10

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 Topics

Create an Outlook Data File (.pst) to save your information
Import email, contacts, and calendar from an Outlook .pst file
Repair Outlook Data Files (.pst and .ost)