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Disable automatic account selection in Outlook 2010

I have mutlipe accounts configured in Outlook 2010. When I create a new message, it automatically selects the sending account based on the folder that I’m currently in instead of using the default configured account.

Is there any way to disable this?

To revert Outlook’s account selection behavior for new messages back to how it was in Outlook 2007, where it always used the default account, requires Service Pack 1 for Office 2010 to be installed or otherwise at least Hotfix KB2547227.

NewItemsUseDefaultSendingAccount Registry Key

When you have that installed, you can add the following Registry value;

Key: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Options\Mail
Value name: NewItemsUseDefaultSendingAccount
Value type: REG_DWORD
Value: 1

If the value is set to 1, new messages will have the default account set as the sending account. If the value is set to 0 or is missing, then the selected sending account matches the mailbox of the current folder that you are in.

Note: This key does not apply to replies and forwards. When you reply or forward a message, Outlook will always automatically select the account that you have received the message with. There is no way to change this other than to change the account manually before sending or to force Outlook to always prompt you for the sending account.