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File Formats Indexed By Exchange Search

 

Applies to: Exchange Server 2013, Exchange Online

Topic Last Modified: 2014-03-21

In Microsoft Exchange Server 2013 and Exchange Online, Exchange Search includes filters for indexing most common types of file formats included as message attachments. You can also install filters to index additional file types.

NoteNote:
In Exchange 2013, it isn’t required to install and register Microsoft Office Filter Pack.

When managing or using Exchange Search and the dependent features (such as In-Place eDiscovery), consider the difference between unsearchable items and file formats that are disabled for indexing or contain content that can’t be indexed:

  • Unsearchable items   When Exchange Search can't index a particular file type for any reason (for example, if a filter isn't installed), the search for the file type fails. Messages containing such attachments are marked as partially indexed. Unsearchable items can be retrieved using the Get-FailedContentIndexDocuments cmdlet. When copying In-Place eDiscovery search results to a discovery mailbox or exporting search results to a PST file, you can include unsearchable items. For more information, see Unsearchable Items in Exchange eDiscovery.

  • File formats with content that can’t be indexed   Certain file types such as Windows Media Video (WMV) don't contain content that can be indexed and therefore aren't indexed. Messages containing attachments of such file types are also returned as unsearchable items in In-Place eDiscovery searches.

  • Disabled file formats In on-premises organizations, an administrator can disable indexing of a specified file format. Messages that contain an attachment that is of a disabled format are returned as unsearchable items.

ImportantImportant:
Although a message attachment may be unsearchable or is of a file format that can’t be indexed, the message subject, message body and other metadata may be indexed so that the message can be returned in searches.

For additional management tasks related to Exchange Search in on-premises organizations, see Exchange Search Procedures.

The following table lists the default search filters installed on an Exchange 2013 Mailbox server and in Exchange Online. You can retrieve the list of default filters by using the Get-SearchDocumentFormat cmdlet.

 

Filter File extension

Email message

.eml

Graphics Interchange Format

.gif

JPEG

.jpeg

Microsoft Excel

.xls, .xlt, .xlsx, .xlsm, .xlb, .xlc, .xlsb

Excel File

odbcexcel

Microsoft InfoPath

.infopathml

Microsoft Office Binder

.obt, obd

Microsoft PowerPoint

.pptx, .pptm, .ppt, .ppsx, .ppsm, .pps, .ppam, .potm, .pot, .potx

Microsoft Publisher

.pub

Microsoft Word

.doc, .docm, .dotx, .dotm, .dot, .docx

Microsoft XML Paper Specification

.xps

OneNote

.one

OpenDocument Presentation

.odp

OpenDocument Spreadsheet

.ods

OpenDocument Text

.odt

Outlook Item

.msg

Portable Document Format

.pdf

Rich Text

.rtf

Text

.txt

vCalendar

.vcs

vCard

.vcf

Visio

.vdw, .vsd, .vss, .vst, .vsx, .vtx, .vssx, .vssm, .vsdm, .vstx, .vstm, .vdx

Web archive

.mhtml

Web page

.html

XML document

.xml

ZIP archive

.zip

The following table lists the search filters that are disabled for indexing by default on an Exchange 2013 Mailbox server and in Exchange Online. In Exchange 2013, administrators can disable or re-enable a supported file format for indexing by using the Set-SearchDocumentFormat cmdlet. This cmdlet isn’t available in Exchange Online.

 

Filter File extension

AVI

.avi

Bitmap

.bmp

MP3

.mp3

MPEG

.mpeg

PNG

.png

Microsoft Windows Wave Audio

.wav

 
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