There is only one file type that uses the .OBI extension:
Outlook RSS Subscription File

- Developer Microsoft
-
Popularity
- Category Settings Files
- Format XML
File created by Microsoft Outlook, a calendar and email program; contains RSS subscription names and properties in an XML format; used to store RSS feed subscriptions for an outlook profile.
OBI files are named using the convention <profilename>.sharing.xml.obi. They are typically located in the following user directory:
AppData\Local\Microsoft\Outlook.
OBI files can be exported to Outline Processor Markup Language (.OPML) files by selecting the following option in Outlook:
.Software's name | License | Platforms |
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Updated: September 28, 2009