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What file extension is associated with Microsoft Outlooks offline file?


Answers :

.OST, This file is generated by the application for the purpose of storing the content of the user's mailbox on the local hard drive for offline use. In Office XP and earlier versions, the OST file will become corrupt if its size grows to over 2 gigabytes, generally causing Outlook to freeze up in use or while starting up. Reducing the size of the mailbox and manually deleting the file is the solution for this condition (a new file is created automatically the next time the program is started). Office 2003 features a new format for the file with support for a 20-gigabyte working file size. The "OST" is directly linked to the Microsoft Exchange profile which created the file. there are 3rd party software providers that supply programs to recover orphan OST files
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  • Outlook data files (.pst)
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  • \015\012Offline Folders file (.ost)
  • \015\012
  • \015\012Personal Address Book (.pab)
  • \015\012
  • \015\012Offline Address Books (.oab)
  • \015\012
  • \015\012Command bar and menu customizations (.dat)
  • \015\012
  • \015\012Navigation Pane settings (.xml)
  • \015\012
  • \015\012Registered Microsoft Exchange extensions (.dat)
  • \015\012
  • Outlook contacts nicknames (.nk2)
  • \015\012
  • Rules (.rwz)
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