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How to enable transport logging in Outlook

Support for Office 2003 has ended

Microsoft ended support for Office 2003 on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
Summary
Microsoft Outlook supports the logging of the communications that occur between Outlook and various types of email servers. These logs can be helpful when you troubleshoot problems that affect the transfer of messages between Outlook and the email server.

Outlook can log the communications among Microsoft Exchange, Post Office Protocol version 3 (POP3), Simple Mail Transport Protocol (SMTP), Internet Messaging Access Protocol (IMAP), and Outlook.com servers.
More information
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.

How to enable logging

To have us enable the mail logging option for you, go to the "Here's an easy fix" section. If you prefer to enable the mail logging option yourself, go to the "Let me fix it myself" section.

Here's an easy fix

To enable the mail logging option automatically, click the Download button. In the File Download dialog box, click Run or Open, and then follow the steps in the easy fix wizard.
  • This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
  • If you’re not on the computer that has the problem, save the easy fix solution to a flash drive or a CD, and then run it on the computer that has the problem.
For Windows 10, Windows 8.1, Windows 8, Windows 7
For Windows Vista, Windows XP, Windows Server 2008 or Windows Server 2003

Let me fix it myself

Enable logging

To enable logging, follow the steps for your version of Outlook.

Microsoft Outlook 2016, Microsoft Outlook 2013 and Microsoft Outlook 2010

  1. On the File tab, click Options.
  2. In the Outlook Options dialog box, click Advanced.
  3. In the Other section, select the Enable troubleshooting logging (requires restarting Outlook) check box, and then click OK.
  4. Exit and then restart Outlook.

Microsoft Outlook 2007 and earlier versions

  1. On the Tools menu, click Options.
  2. Click the Other tab.
  3. Click the Advanced Options button.
  4. Select the Enable mail logging (troubleshooting) check box.
  5. Click OK to save the setting, and then return to the main Options screen.
  6. Click OK.
  7. Exit and then restart Outlook.

Outlook Connector in Outlook 2010

Enable logging
To enable logging for Outlook Connector version 14 in Outlook 2010, configure the following registry data.
  • Subkey: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Options\Mail
  • DWORD: EnableLogging
  • Value: 1
  • Subkey: HKEY_CURRENT_USER\Software\Microsoft\Microsoft Office Outlook Connector
  • DWORD: TracingLevel
  • Value: 3
Disable logging
To disable logging for Outlook Connector version 14 in Outlook 2010, configure the following registry data.
  • Subkey: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Options\Mail
  • DWORD: EnableLogging
  • Value: 0
  • Subkey: HKEY_CURRENT_USER\Software\Microsoft\Microsoft Office Outlook Connector
  • DWORD: TracingLevel
  • Value: 0

Logging results

When you enable logging, the following registry data is configured.

Subkey:
HKEY_CURRENT_USER\Software\Microsoft\Office\<1x.0>\Outlook\Options\Mail
DWORD: EnableLogging
Values: 1 = logging enabled, 0 = logging disabled

Note In the subkey, <1x.0> represents the program version number ("15.0" = Outlook 2013, "14.0" = Outlook 2010, "12.0" = Outlook 2007).

After you enable logging, all communications that occur between Outlook and the email server are written to a log file.

Important You must disable logging after the logs capture the failed communication to the server. If you do not disable logging, the logs continue to grow indefinitely.

Log file locations

The log files are formatted as plain text. To find the log files, look in the following locations, depending upon your version of Outlook and also your version of Windows, if you are running Outlook 2007 or an earlier version.

Microsoft Outlook 2016, Outlook 2013 and Outlook 2010

POP3, SMTP, MAPI logs
The POP3, SMTP, and MAPI transport types are written to a single log file in the following location:
%temp%\Outlook Logging\Opmlog.log

Note The Opmlog.log file also contains some information that is related to the Outlook Connector.
IMAP logs
The IMAP transport type is written to the following location:
%temp%\Outlook Logging\IMAP-usernamedomainname-date-time.log

For example: IMAP-user1wingtiptoyscom-03_23_2010-12_49_31_798.log
Outlook Connector v. 14 log
The Outlook Connector version 14 log file is written to the following location:
%temp%\OLC Logging\OLC-smtp_address-date-time.log

For example: OLC-guidopica@contoso.com-03_23_2010-16_13_10_803.log

For Outlook 2007 and earlier versions

POP3, SMTP, MAPI logs
The POP3, SMTP, and MAPI transport types are written to a single log file in the following locations.
  • Windows XP and Windows 2000
    C:\Documents and Settings\<logon name>\Local Settings\temp\OPMLOG.LOG
  • Windows 98, Windows 98 Second Edition, and Windows Millennium Edition (Me)
    C:\Windows\temp\OPMLOG.LOG
IMAP logs
The IMAP transport type is written to a log file in the following locations.
  • Windows 2000
    C:\Documents and Settings\<logon name>\Local Settings\temp\Outlook Logging\<NameOfIMAPServer>\IMAP0.LOG, IMAP1.LOG, and so on
  • Windows 98, Windows 98 Second Edition, and Windows Me
    C:\Windows\temp\Outlook Logging\<NameOfIMAPServer>\IMAP0.LOG, IMAP1.LOG, and so on
Outlook.com logs
The Outlook.com log file is written to the following locations.
  • Windows 2000
    C:\Documents and Settings\<logon name>\Local Settings\temp\Outlook Logging\Hotmail\Hotmail0.LOG, Hotmail1.LOG, and so on
  • Windows 98, Windows 98 Second Edition, and Windows Me
    C:\Windows\temp\Outlook Logging\Hotmail\Hotmail0.LOG, Hotmail1.LOG, and so
Notes
  • IMAP and Outlook.com accounts generate one log for each Send or Receive action that you perform on these accounts. (The log files are named Hotmail0.LOG, Hotmail1.LOG, etc.)
  • If you have multiple Outlook.com accounts configured, the folders in which the logs are stored are named Hotmail, Hotmail 1, Hotmail 2, and so on.
  • You may have to close Outlook so that the logs can be written to the log files.

OfficeKBHowTo diagnostic OL2002 logging logs create log file ol2003 OL2007 OL2010 fixit fix it
Properties

Article ID: 300479 - Last Review: 03/08/2016 04:18:00 - Revision: 24.0

  • Outlook 2016
  • Microsoft Outlook 2013
  • Microsoft Outlook 2010
  • Microsoft Office Outlook 2007
  • Microsoft Office Outlook 2003
  • Microsoft Outlook 2002 Standard Edition
  • kbtransport kbinfo kbfixme kbmsifixme KB300479
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