Its main purpose is to extract text from files so the Indexing Service can index them and later search them. Some versions of Windows comes with IFilter implementations for Office files, and there are free and commercial filters available for other file types Adobe PDF filter is a popular one. Although the IFilter interface can be used for general purpose text extraction from documents, it is generally used in search engines. Windows Desktop Search uses filters to index files.
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Transport rules with attachment scanning conditions perform text extraction when analyzing the content of attachments. Exchange can scan most commonly used attachment types natively. Additional attachment types can be included by registering IFilters with Exchange This topic shows you how to register IFilters released by Microsoft and third-party providers.
After you register an IFilter for a specific file type, transport rules with attachment processing conditions will be able to scan these attachments. As a result, these file types will no longer trigger the AttachmentIsUnsupported condition. The procedures listed in this topic involve modifying the registry on your Exchange servers. Incorrectly editing the registry can cause serious problems that may require you to reinstall your operating system.
Problems resulting from editing the registry incorrectly may not be able to be resolved. Before editing the registry, back up any valuable data. These procedures also require you to stop and restart the Microsoft Exchange Transport service on your Mailbox servers. For additional management tasks related to Transport rules, see Manage transport rules in Exchange You need to be assigned permissions before you can perform this procedure or procedures.
To see what permissions you need, see the "Exchange server configuration settings" entry in the Exchange and Shell infrastructure permissions topic. You must perform the procedures below on servers that already have Exchange Mailbox server role installed.
If you add additional Mailbox servers after you perform these procedures, you must perform them again on the newly provisioned servers. For information about keyboard shortcuts that may apply to the procedures in this topic, see Keyboard shortcuts in the Exchange admin center. Having problems? Ask for help in the Exchange forums.
Visit the forums at Exchange Server. If you want to support these files, you must deploy the Microsoft Office Filter Pack. This Filter Pack isn't deployed during Exchange Setup and isn't a prerequisite for deployment.
Modifying the registry so the IFilters are also registered with Exchange This allows Exchange to support attachment scanning for the file formats. Run the FilterPack64bit. Click the key you just created and set the Default value to where you installed the Office Filter Pack.
Right-click filters , point to New , and then click Key. Right-click filters , point to New and then click Key. Create a Transport rule with the following properties. For detailed instructions about how to create Transport rules, see Manage transport rules in Exchange Create a OneNote file that contains the phrase "Testing IFilters", attach it to a new email message, and send it to yourself.
Verify that you receive a Transport rule incident report for the rule you just created. This confirms that the rules engine was able to analyze the contents of the OneNote file. You can extend the attachment scanning capability for additional file types by registering additional third-party IFilters. Support for additional files can be added by installing and registering the file type's IFilter on each of your Mailbox servers.
Microsoft hasn't tested third-party IFilters with transport rules, therefore we recommend that you deploy and test any third-party IFilters in a test environment before deploying into your production environment. By default, Exchange supports the scanning of PDF files in transport rules. The PDF example here is used simply to illustrate how you can extend support for additional file types using third-party IFilters. Use the same procedure listed in the How do you know this worked?
Use transport rules to inspect message attachments. Mail flow or transport rules. Transport rule conditions predicates.
Transport rule actions. Skip to main content. Exit focus mode. Warning The procedures listed in this topic involve modifying the registry on your Exchange servers. Tip Having problems? Important You must perform this procedure on all Mailbox servers in your organization.
Important Microsoft hasn't tested third-party IFilters with transport rules, therefore we recommend that you deploy and test any third-party IFilters in a test environment before deploying into your production environment.
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Using IFilter in C#
Transport rules with attachment scanning conditions perform text extraction when analyzing the content of attachments. Exchange can scan most commonly used attachment types natively. Additional attachment types can be included by registering IFilters with Exchange This topic shows you how to register IFilters released by Microsoft and third-party providers. After you register an IFilter for a specific file type, transport rules with attachment processing conditions will be able to scan these attachments.
Register Filter Pack IFilters with Exchange 2013
In order to take advantage of the full text search feature in the ENOVIA Document Management application, full text servers must be activated on each vault server on which the full text indexing feature is enabled. For example, the full text server is designed to be activated principally on vaults intended to store specification or maintenance documents in various word processing or spreadsheet formats. A full text server need not be activated on vaults dedicated to storing CAD data or images, since there would be no text to index. The Microsoft Index Server MIS feature must be installed on the vault server running a vault with documents needing to be indexed in full-text mode.
Activating the Full Text Server on Vault Servers