How can we configure our computers to use IRM?

If you use a computer that is running Windows7 or Windows Vista, the Windows Rights Management Services (RMS) Client is already installed. If you use a computer that is running Windows XP, the Windows Rights Management Services (RMS) Client Service Pack2 (SP2) or a later version must be installed on your computer, either by you or by the RMS administrator for your organization.

The RMS administrator can configure company-specific IRM policies that define who can access information and what level of editing is permitted for an email message.

Install the Windows Rights Management Services (RMS) Client

1. In Windows XP, click the Start button, and then click Control Panel.
2. Click Add or Remove Programs, and then click Add or Remove Programs.
3. Click Add New Programs.
4. From the list of programs, click Windows Rights Management Services Client, and then click Add.

 Note    In Classic view, double-click Add or Remove Programs, and then in the left pane, click Add New Programs. From the list of programs, click Windows Rights Management Services Client, and then click Add.

Or, when you first try to open files that are rights-managed by IRM, Microsoft Office prompts you to download the Windows Rights Management Services Client if you are running a computer without that software. For more information about the Windows Rights Management Services Client or to download it, visit the Windows Rights Management Services page.

http://office.microsoft.com/en-001/outlook-help/introduction-to-using-irm-for-e-mail-messages-HA.aspx

Windows Rights Management Services (RMS) Client is already installed. the Windows Rights Management Services (RMS) Client Service Pack2 (SP2) or a later version should be installed on our computer

we can configure specific IRM policies that define who can access information and what level of editing is permitted for an email message.

Install the Windows Rights Management Services (RMS) Client

1. In Windows  click the Start button, and then click Control Panel, Add or Remove Programs, click Add New Programs.then choose Windows Rights Management Services Client, and click Add.

http://technet.microsoft.com/en-us/library/cc178985.aspx

    In Windows XP, click the Start button, and then click Control Panel.

    Click Add or Remove Programs, and then click Add or Remove Programs.

    Click Add New Programs.

    In the list of programs, click Windows Rights Management Services Client, and then click Add.

 Note   In Classic view, double-click Add or Remove Programs, and then in the left pane, click Add New Programs. In the list of programs, click Windows Rights Management Services Client, and then click Add.

Alternatively, when you first try to open files that have been rights managed by using IRM, the2007 Office release prompts you to download the Windows Rights Management Services Client if you are running a computer without that software. For more information about the Windows Rights Management Services Client, visit the Windows Rights Management Services Web site.

If you use a computer that is running Windows Vista, the Windows Rights Management Services (RMS) Client is already installed. If you use a computer that is running Microsoft Windows XP, the Windows Rights Management Services (RMS) Client Service Pack1 (SP1) must be installed on your computer either by you or your RMS administrator.

The RMS administrator can configure company-specific IRM policies that define who can access information and what level of editing is permitted for an e-mail message. For example, a company administrator might define a rights template called "Company Confidential," which specifies that an e-mail message that uses that policy can be opened only by users inside the company domain.

Install the Windows Rights Management Services (RMS) Client

 NOTE   If you use a computer that is running Windows Vista, the Windows Rights Management Services (RMS) Client is already installed.

1. In Windows XP, click the Start button, and then click Control Panel.
2. Click Add or Remove Programs, and then click Add or Remove Programs.
3. Click Add New Programs.
4. From the list of programs, click Windows Rights Management Services Client, and then click Add.

 NOTE   In Classic view, double-click Add or Remove Programs, and then in the left pane, click Add New Programs. From the list of programs, click Windows Rights Management Services Client, and then clickAdd.

Alternatively, when you first try to open files that have been rights-managed by using IRM, the2007 Office release prompts you to download the Windows Rights Management Services Client if you are running a computer without that software. For more information about the Windows Rights Management Services Client, visit theWindows Rights Management Services Web site.

Install the Windows Rights Management Services (RMS) Client

1. In Windows XP, click the Start button, and then click Control Panel.
2. Click Add or Remove Programs, and then click Add or Remove Programs.
3. Click Add New Programs.
4. From the list of programs, click Windows Rights Management Services Client, and then click Add.

If you use a computer that is running Windows7 or Windows Vista, the Windows Rights Management Services (RMS) Client is already installed. If you use a computer that is running Windows XP, the Windows Rights Management Services (RMS) Client Service Pack2 (SP2) or a later version must be installed on your computer, either by you or by the RMS administrator for your organization.

The RMS administrator can configure company-specific IRM policies that define who can access information and what level of editing is permitted for an email message.

Install the Windows Rights Management Services (RMS) Client

In Windows XP, click the Start button, and then click Control Panel.

Click Add or Remove Programs, and then click Add or Remove Programs.

Click Add New Programs.

From the list of programs, click Windows Rights Management Services Client, and then click Add.  have fun doing this 

http://technet.microsoft.com/en-us/library/cc178985(v=office.15).aspx

Please refer above Link 

You can turn off IRM for all Office applications. To turn off IRM in Outlook2013, you must turn off IRM for all Office applications. There is no separate option to turn off IRM only in Outlook.

1. In Group Policy, load the Office2013 template (Office15.admx) and locate User Configuration\\Administrative Templates\\Microsoft Office2013\\Manage Restricted Permissions.

2. Choose Turn Off Information Rights Management User Interface.

3. Choose Enabled.

4. Choose OK.

By default, Outlook2013 automatically downloads the IRM license for rights-managed email when Outlook synchronizes with Exchange Server. You can configure Outlook2013 to prevent license information from being cached locally. This forces users to connect to the network to retrieve license information before they can open rights-managed email messages.

1. In Group Policy, load the Outlook2013 template (Outlk15.admx) and locate User Configuration\\Administrative Templates\\Microsoft Outlook2013\\Miscellaneous.

2. Choose Do not download rights permission license information for IRM email during Exchange folder sync.

3. Choose Enabled.

4. Choose OK.

The IRM policy settings that are available in the Office Group Policy template (Office14.admx) can be configured to point to the location where the rights policy templates are stored (either locally or on an available server share).

1. In Group Policy, load the Office2010 template (Office14.admx) and locate User Configuration\\Administrative Templates\\Microsoft Office2010\\Manage Restricted Permissions.

2. Choose Specify Permission Policy Path.

3. Choose Enabled.

4. In the Enter path to policy templates for content permission box, type the full path of the IRM permission policy templates.

5. Choose OK.