Introduction to IRM for email messages
You can restrict permission to content in email messages in Outlook with Information Rights Management (IRM), just as you can restrict permission to other Microsoft Office files.
Important: If you're using Office on a Surface RT device, you can view IRM-protected mail, but you can't send. Want to see what version of Office you're using?
Information Rights Management (IRM) allows you to specify access permissions to email messages. IRM helps prevent sensitive information from being read, printed, forwarded, or copied by unauthorized people. IRM also helps organizations enforce corporate policy governing the control and dissemination of confidential or proprietary information, both within the organization and with customers and partners.
After permission for a message is restricted by using IRM, the access and usage restrictions are enforced regardless of where the message goes, because the permissions to access an email message are saved in the message file itself.
Note: IRM can't prevent content from being erased, stolen, corrupted, or captured and transmitted by malicious programs or computer viruses. It also can't prevent restricted content from being hand-copied or retyped, or prevent a digital photograph or screen capture being taken of the restricted content.
The first time that you try to open an email message that uses restricted permission, you are connected to a licensing server. If the licensing server verifies your credentials, it issues a use license, which defines the level of access that you have to a file. This process is required for each file that uses restricted permission. In other words, content with restricted permission can't be opened if the licensing server hasn't issued you a use license for that content.
View messages when IRM isn't available
If you must read or open content with restricted permission but Outlook isn't available on the computer that you are using, you can use a web browser. If you use Outlook on the web or Outlook Web App (OWA), you can view restricted messages on any browser.
File types covered by IRM policies when they are attached to messages
When the following file types are attached to a rights-managed message in Outlook, they are automatically rights-managed.
Note: If you attach Outlook message files (.msg) to a rights-managed message (such as forwarding multiple Outlook messages within one message), the attached messages aren't rights managed.
Word documents
| File type | Extension |
| Document | .doc |
| Document | .docx |
| Macro-enabled document | .docm |
| Template | .dot |
| Template | .dotx |
| Macro-enabled template | .dotm |
Excel documents
| File type | Extension |
| Workbook | .xls |
| Workbook | .xlsx |
| Macro-enabled workbook | .xlsm |
| Template | .xlt |
| Template | .xltx |
| Macro-enabled template | .xltm |
| Non-XML binary workbook | .xlsb |
| Macro-enabled add-in | .xla |
| Macro-enabled add-in | .xlam |
PowerPoint documents
| File type | Extension |
| Presentation | .ppt |
| Presentation | .pptx |
| Macro-enabled presentation | .pptm |
| Template | .pot |
| Template | .potx |
| Macro-enabled template | .potm |
| Show | .pps |
| Show | .ppsx |
| Macro-enabled show | .ppsm |
| Office theme | .thmx |
InfoPath files
| File type | Extension |
| Dynamic Form/Template | .xsn |
XPS documents
| File type | Extension |
| XML Paper Specification | .xps |
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