A user’s Office 365 email address unexpectedly contains an underscore character after directory synchronization

Article ID: 2001616 - View products that this article applies to.

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PROBLEM

After the Windows Azure Active Directory Sync Tool runs to sync your on-premises Active Directory environment to Windows Azure Active Directory, a user’s Office 365 email address unexpectedly contains an underscore character "_". 
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CAUSE

This occurs if the user account in your on-premises environment has a proxyaddresses attribute or mail attribute that contains one or more of the following special characters:
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CharacterName
space character
`apostrophe
(opening parenthesis
)closing parenthesis
@at sign
'single quotation mark
&ampersand
\pipe
=equal sign
?question mark
/forward slash
%percent
In this scenario, after directory synchronization is run, the special character is replaced by an underscore character. Therefore, the user’s Office 365 email address contains an underscore character instead of the special character.
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SOLUTION

Remove the special characters from the proxyaddresses attribute of the user account in the on-premises environment.
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MORE INFORMATION

The characters that are listed in the Cause section are treated as special characters in Office 365. Use of any of these characters may cause issues such as service disruption.

Video: Troubleshooting Duplicate or Invalid User Attributes that Prevent Directory Synchronization in Office 365

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Still need help? Go to the Office 365 Community
(http://community.office365.com/)
website.
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Properties

Article ID: 2001616 - Last Review: May 15, 2013 - Revision: 8.0
Applies to
  • Microsoft Office 365 for enterprises (pre-upgrade)
  • Microsoft Office 365 for education  (pre-upgrade)
  • Microsoft Exchange Online
  • Windows Azure Active Directory
Keywords: 
o365 o365a o365062011 pre-upgrade o365062013 after upgrade o365e o365m KB2001616
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