OUTLOOK 2010. Does not reply to emails using the same address that received it.


  • Hello,

    Since last week our Outlook accounts are not working properly, when users reply a message it does not reply using the same address that received it, it appears the personal account instead.

    We are using exchange accounts, using Outlook 2010  and the accounts affected are automapped to a principal account (.ost).

    We already tried to recreate outlook .ost profile, repair Outlook installation, reinstall Office.

    Can somebody help?

    Thanks in advance.

    Wednesday, December 18, 2013 1:02 PM


  • Hi,

    We have received many reports as your description since last week. It sounds like the sending behavior in Outlook 2010 has been changed by some Windows/Office update and goes back to the behavior before.

    Before we go any further, I have to mention some of the history for Outlook 2010. In Outlook 2010 without SP1, Mailto’s will use the default/principal account for message when you use Microsoft Outlook 2010 which has multiple accounts delivered to different data file. However, in later version (Outlook 2010 SP1/SP2), Outlook doesn’t use the default account set in Account settings for new messages. Instead, it uses the account associated with the mailbox or *.pst file you have in focus.

    Actually, this behavior is controlled by the registry keys. At this point, I suggest we check the following registry entries are exist and set it to the proper value.

    DWORD value: NewItemsUseDefaultSendingAccount
    Value type: REG_DWORD: 1 for force, 0 to disable.

    Value Name: ForceAccountSelection
    Value type: REG_DWORD: 1 for force, 0 to disable.

    Close the registry editor and restart Outlook to check if the behavior what you want would come back.

    In addition, our Outlook MVP, Diane Poremsky has written an article with more detail information:

    By the way, we still cannot figure out which update is the root of the issue, if someone could test it and share the result here, I would appreciate that. Feel free to post back.

    Tony Chen
    TechNet Community Support

    Saturday, December 21, 2013 9:53 AM