![]() ![]() Every time a user tries to access their associated Outlook account, the profile is authenticated. The key is stored in the Registry file of the local system and Exchange server. Thus, it can be accessed through the original MAPI profile only. Offline Folder or OST file is encrypted by default with a MAPIEntryID GUID key. Although Outlook can recreate a new OST or PST file as soon as you delete the damaged or corrupt one, items highly suggested keeping the OST or PST file size under recommended limits. This can also cause OST or PST file corruption. You may change this default size limit as per your or your organization's requirements.īut an oversized or large OST or PST may become unstable and lead to Outlook performance issues. However, the default OST and PST file size limits are set to 20 GB in Outlook 2007 and 50 GB in Outlook 2010 and later versions. The maximum size of a Unicode OST or PST file can reach up to 4 PB. ![]() ![]() However, you can change the location of OST and PST files to an external or network storage. Windows VersionĬ:\Users\YourProfileName\AppData\Local\Microsoft\Outlook\Ĭ:\Users\username\Roaming\Local\Microsoft\OutlookĬ:\Documents and Settings\YourProfileName\Local Settings\Application Data\Microsoft\Outlook The following table indicates the default PST file location based on the Windows version. OST and PST file location varies based on Outlook and Windows versions.įor default OST file location, see the table below. On the contrary, the PST file is importable and can be easily accessed through any Outlook profile. Thus, the OST file can’t be accessed or imported into any other Outlook profile. The core difference between OST and PST is that OST is encrypted with MAPEntryID GUID key and requires authentication from linked MAPI profile. Similarly, when a user sets up a POP email account in Outlook, a PST file is created. In Outlook 2010 and later versions, if a user adds an Exchange, IMAP, or Outlook 365 account, an OST data file is created at a default location. In this post, we will compare OST and PST files, and understand the differences between the two Outlook data files in detail. Though both OST and PST are Outlook data files and store all mailbox items locally, there’s a lot of difference between the two files. Outlook creates PST or OST file for mailbox storage based on the email type and Outlook version. The Outlook data file is created when a user adds a new email account in Microsoft Outlook. Offline Storage Table (OST) and Personal Storage Table (PST) are Outlook data files that store a synchronized local or offline copy of mailbox items, such as emails, attachments, contacts, notes, etc. ![]()
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January 2023
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