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Outlook can't connect to Office 365

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Having difficulty connecting Outlook to Office 365?

 

Check out our easy-to-use, self-guided walkthrough troubleshooter!

Office 365 Outlook Connectivity Guided Walkthrough
https://aka.ms/outlookconnectivity

 

Still having issues?  We have a plethora of resources available to resolve your problem:

Office 365: Outlook and mobile device connectivity troubleshooting resources
https://support.microsoft.com/kb/2757863

 

Finally, if your mailbox was migrated from Exchange Online ("EXO") Wave 14 to EXO Wave 15, you may need to update your Outlook profile.  This is due to a change in EXO Wave 15 architecture in which we authenticate at the Transport layer (HTTPS) and no longer require RPC authentication (which will cause repeated prompting for credentials).

To fix the Outlook profile:

  • Start Outlook
  • Click "File"
  • Click the "Account Settings" drop-down, then select "Account Settings"
  • Select your e-mail address, and click "Change"
  • Click "More Settings"
  • Select the "Security" tab, and change the "Logon network security" drop-down to "Anonymous Authentication."

Props to Ryan Phillips for the EXO Wave 15 info!

Hope this helps,

-Scott

Comments

  • Anonymous
    October 03, 2013
    i forgot my password to log in to my e-mails

  • Anonymous
    October 03, 2013
    Hi Bruce, Please see the following article to have your password reset: community.office365.com/.../3931.aspx Hope this helps, Scott Oseychik

  • Anonymous
    April 16, 2014
    Hi Do you know a way to change this setting through Group Policy or registry settings? Tomas

  • Anonymous
    April 17, 2014
    Check out Stephen Griffin's blog for all things MAPI :) blogs.msdn.com/.../stephen_griffin Also, this Microsoft Outlook whitepaper discusses the PR_PROFILE_AUTH_PACKAGE property: office.microsoft.com/.../afile.aspx “Logon network security” drop down corresponds to: HKEY_CURRENT_USERSoftwareMicrosoftOffice15.0OutlookProfiles[your profile][some subkey] 00036619 REG_BINARY value of 01F00080 sets this to "Anonymous"

  • Anonymous
    April 30, 2014
    Hi Scott, This is the exact issue I'm facing except I used the Microsoft Office Customization Tool to create a PRF file. I was surprisingly simple, but there was no setting to change "Logon network security" to anonymous. Would you happen to know the value / syntax to add to my PRF file to manually customize it?

  • Anonymous
    May 07, 2014
    Hi Dan, Sorry about the delayed reply; unfortunately, I'm not versed in the Office Customization Tool.  Encourage you to open a case with Customer Support Services, and reference this discussion.  Specifically, see above where we've discussed the Registry Key / value that controls this, but isn't exposed in the Office Customization Tool.  Thanks! Regards, Scott Oseychik

  • Anonymous
    July 02, 2014
    The comment has been removed

  • Anonymous
    July 02, 2014
    The comment has been removed

  • Anonymous
    July 24, 2014
    Outlook 2010 SP1 has no option for Anonymous in the "Logon network security" dropdown. This is still a supported version, so what do we do with this? We're getting credentials prompts continuously.

  • Anonymous
    July 28, 2014
    @Fergus I encourage you to engage Microsoft Customer Support Services (CSS).  We should be able to identify which post-SP1 patch your Outlook clients need, or perhaps recommend SP2.  I'll leave this to the Outlook experts here in Support. Best, Scott Oseychik

  • Anonymous
    July 28, 2014
    Thanks Scott. I did and they advised the following: community.office365.com/.../updates-to-outlook-2010-and-outlook-2007.aspx The page doesn't mention any service packs but the fix ending 623 doesn't seem to install without SP1. It's frustrating getting part-information from MS and having to spend a lot of time finding out what's wrong while you wait for CSS to get back to you. This is just for anyone else wondering the same thing. F.

  • Anonymous
    July 29, 2014
    Hi Fergus, I can understand your frustration here, and after reviewing the KB article you referenced (support.microsoft.com/.../2687623), I see no mention of SP1 being a pre-requisite.  Normally our KB articles call out any pre-reqs that must be satisfied prior to install, but clearly, we've made a mistake on this article.  While it may be of little value / consolation to you now, I'll make sure this article is corrected. Regards, Scott Oseychik

  • Anonymous
    October 16, 2014
    Thanks for solution for PRF file. you are the best!!

  • Anonymous
    March 31, 2015
    Hi -- I have had the same login and password for my work email for two years, but, ever since we switched over to Office 365, when I try to login into my Office 365 GoDaddy account online (not through Outlook), I keep getting this message: "Authentication failed. You entered an incorrect username or password." I have never changed my password and my phone, ipad, personal comp and outlook on my work comp all sync just fine and don't give me error messages like that. What can I do so I can remote access my email? Please let me know. Thanks!

  • Anonymous
    April 06, 2015
    Hi Daniella, I'm inferring your statement to mean that you're trying to use Outlook Web App (e.g. https://mail.office365.dom or similar)?  If so, please be sure to use your e-mail address as your username when you are prompted for authentication. Regards, Scott Oseychik

  • Anonymous
    July 01, 2015
    @Scott, I don't see the "Annonymous Authentication" option, only the first four option. How to enable it? Thank you.