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After viewing the Outbox, the messages in it won't send.

If you click on the Outbox while messages are waiting to be sent, the messages are marked as read and won't send.

This is caused by a Net framework add-in you have installed that 'reads' Outlook items, including the Send to OneNote from Outlook PowerToy add-in and BCM (Business Contact Manager). A list of other add-ins known to cause this behavior is listed below.

To send the affected messages, you'll need to open the message, then switch to a different folder before clicking Send on the message. Do not go open the Outbox until after the messages are sent.
  To identify the add-in that results in this behavior:

Look in Tools, Options, Other, Advanced, Com add-ins. Disable the add-ins and re-enable them one at a time and test.

Since BCM and possibly other add-ins are not listed in the COM add-in list, check

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins
  • HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins
    •

    Export the keys then change the LoadBehavior value to 0 to disconnect an add-in. Restart Outlook and test.

    Applications responsible

    The following is a list of some of the applications which are reported to cause message to be marked as read. If you use these or any other add-ins, check for a newer version - newer versions of some of these applications will not cause problems. 

  • ICQExpress (COMAddin), installed as part of ICQ
  • Business Contact Manager (BCM)
  • Send to OneNote from Outlook PowerToy
  • Outlock
  • Outlook Backup Add-in
  • Sierra Wireless Outlook Integration - disable in the registry. It's listed at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins\SwiOutlookInt.Addin
  • ONFOLIO
  • Timeslips add-in
  • Attensa for Outlook. Check for upgrade: newer versions not affected.
  • Cisco Meetingplace plug-in
  • MindJet Mind Manager 6. Disable the add-in in the registry - the key is Mindjet.Mm6OutlookLinker.AddIn.2
  • Google desktop "search your own computer", specifically because it searches the mail
  • ScanSoft PDF Converter Outlook Addin
  • Norton AntiSpam Outlook Plugin
  • Norton Internet Security
  • AIM Sync
  • LinkedIn Outlook Toolbar
  • Salesforce
  • Upshot Outlook integration
  • MS CRM 3.0 Outlook Add-in
  • Xobni
  • Auto-Mate
  • RingCentral Add-in
  • DesktopSMS.Addin
    •    

    More Information

    		 If your mail won't send and it's not the problem described above, other possible causes are:
  • Authentication problems: Are you logging on to the mail server correctly?
  • No default mail account. If you can reply to messages but not send new message, check the account settings and make sure one is set as default. When you use a configuration script created by your mail provider or import accounts, an account is not always set as default.
    •  See Email Won't Send - Common Causes for more information.
    Updated Apr 09 2008
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