Microsoft Outlook

What is Microsoft® Outlook?

MS Outlook is personal information manager which is available in MS Office suite. It is a powerful email application and used all over the world amongst millions of organizations. It is widely used with Exchange and SharePoint for extraordinary results.

Microsoft Outlook uses OST and PST files for storing data.

What is OST:

OST is shortened for Offline Storage Files which is Exchange server database. During synchronization of Exchange with Outlook, OST file is created. It stores Outlook data such as Emails, Contacts, Calendars, Notes, To-do list, Tasks, etc in the offline mode when disconnected to Exchange server. As soon as Outlook’s connection is maintained internet, the alterations in the offline mode get synchronized with Exchange server.

  • OST File Location:
    Windows 10 and Prior Versions: drive:\Users\user\AppData\Local\Microsoft\Outlook
    Windows XP: drive:\Documents and Settings\user\Local Settings\Application Data\Microsoft\Outlook
  • Manual Method to Convert OST to PST:
    Note: To convert OST to PST format by using manual method you need to have connection with MS Exchange server otherwise process fails to help you in any manner.

    • Start Outlook
    • Click File » Export to a file » Next
    • Select PST file and press Next
    • Choose the folders that you need to export and mark it as “Include Subfolders“.
    • Browse the location for storing exported data and then press “Finish“.

What is PST:

PST stands for Personal Storage Table which is the default file stores Outlook data like emails, contacts, calendars, to do list, tasks, etc.

  • PST File Limitation:
    Outlook stores all the email messages and complete mailbox items into PST or Personal Storage Table file. These are of two types ANSI and Unicode. ANSI file format has 2 GB file size limitation and it cannot go beyond 2 GB limit. On the other hand, Unicode PST file consisted of PST files from Outlook 2003 to further more editions which offer 20 GB to 50 GB storage space.

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