The default e-mail client is changed to Outlook 2007 after you install the 2007 Office system

After you install the 2007 Microsoft Office system, the current default e-mail client is changed to Microsoft Office Outlook 2007. For example, your default e-mail client changes from Microsoft Outlook Express to Outlook 2007.

By default, the Microsoft Office setup process configures Outlook as the default e-mail, calendar, and contacts client.

To resolve this issue, use one of the following methods.

Method 1: Pre-deployment

If you have not deployed the 2007 Office system, use the Office Customization Tool (OCT) to create an .msp file. Then, use the .msp file to deploy the 2007 Office system. To do this, follow these steps:

1. Start the OCT. To do this, click Start, click Run, type Office installation CD\setup.exe /admin, and then click OK.
   
   Note The /admin switch is used only for Microsoft Office Enterprise 2007.
2. In the Select Product dialog box, click OK.
3. In the navigation pane, click Modify Setup properties in the Setup area.
4. Click Add to add one or more of the following properties and values.
   Collapse this tableExpand this table

   Name	Value
   OUTLOOKASDEFAULTCONTACTSAPP	0
   OUTLOOKASDEFAULTCALENDARAPP	0
   OUTLOOKASDEFAULTMAILAPP	0

   Note The names of these properties are case-sensitive. The names must be typed in all uppercase letters. Additionally, not all the properties are required. For example, if you only want to keep Outlook 2007 from being the default e-mail client, use only the OUTLOOKASDEFAULTMAILAPP property.
5. To prevent users from being prompted to set the default e-mail, calendar, and contacts client when they start Outlook 2007 for the first time, follow these step in the OCT:
   1. In the navigation pane, click Modify user settings in the Features area.
   2. Expand Microsoft Office Outlook 2007, expand Tools | Options, and then click Other.
   3. Double-click Make Outlook the default program for E-mail, Contacts, and Calendar, click to select the Disabled check box, and then click OK.
6. On the File menu, click Save to save the .msp file.
7. Exit the OCT.
8. Put the .msp file in the Office installation CD\Updates folder.
9. Install the 2007 Office system from the 2007 Office system installation CD.

Method 2: Post-deployment

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

If you have deployed the 2007 Office system, and you want to change the default e-mail, calendar, and contacts client, follow these steps:

1. Start the OCT. To do this, click Start, click Run, type Office installation CD\setup.exe /admin, and then click OK.
   
   Note The /admin switch is used only for Microsoft Office Enterprise 2007.
2. In the Select Product dialog box, click OK.
3. In the navigation pane, click Add registry entries in the Additional content area.
4. Click Add to add one or more of the following registry entries.
   Collapse this tableExpand this table

   Root	Data type	Key	Value name	Value data
   HKEY_LOCAL_MACHINE	REG_SZ	Software\Clients\Mail	Leave blank	Your default e-mail client
   HKEY_LOCAL_MACHINE	REG_SZ	Software\Clients\Calendar	Leave blank	Your default calendar client
   HKEY_LOCAL_MACHINE	REG_SZ	Software\Clients\Contacts	Leave blank	Your default contacts client

   Note To determine the correct name to use for the value data for these registry entries, follow these steps:
   1. Start Internet Explorer.
   2. On the Tools menu, click Internet Options.
   3. On the Programs tab, click the E-mail list. Determine the name of the e-mail client that you want to configure as the default e-mail client. Then, use that name for the value data for the registry entry.
   4. Similarly, you can find the value data for the default calendar client and for the default contacts client on the Programs tab of the Internet Options dialog box.
5. To prevent users from being prompted to set the default e-mail, calendar, and contacts client when they start Outlook 2007 the first time, follow these step in the OCT:
   1. In the navigation pane, click Modify user settings in the Features area.
   2. Expand Microsoft Office Outlook 2007, expand Tools | Options, and then click Other.
   3. Double-click Make Outlook the default program for E-mail, Contacts, and Calendar, click to select the Disabled check box, and then click OK.
6. On the File menu, click Save to save the .msp file.
7. Exit the OCT.
8. To apply the .msp file to the clients, double-click the .msp file, or run the following command at the command prompt:
   msiexec.exe /p path\ filename.msp