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Fixes or workarounds for recent issues on

This article is for If you're using Outlook for Windows, see Fixes or workarounds for recent issues in Outlook for Windows.

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Last updated: May 21, 2018 issues affecting email messages, attachments, and features

Last updated: July 2, 2018


Customers are currently unable to access account pages using Internet Explorer, with the error "Upgrade your browser".

Upgrade your browser message

Windows 10 users are unable to progress with any upgrade because Windows 10 includes the latest version of Internet Explorer.


Use Microsoft Edge or another web browser.

Last updated: February 15, 2018


You may get this error when sending emails using your "Send Only" connected account:

"Something went wrong and we haven't been able to send your message yet."


This is a known issue and will be fixed in a future build.


The status of some connected accounts shows as “Update in progress error”. The delivery of connected account email may not be affected.


This is a known issue and will be fixed in a future build.


Email sent from your connected account shows as being sent on behalf of your Microsoft account.


This is a known issue and will be fixed in a future release. Until then, you can change your From address to be the same as your primary Microsoft account alias.

For more information, read how to fix sends email "on behalf of" my email address.


Cleaning up a large number of duplicate or similar contacts does not work.


This is a known issue and will be fixed in a future release. Until then, you can still clean up contacts, but we recommend cleaning up in batches of fewer than 50 contacts at a time.

For more information, read how to Clean up or remove duplicate contacts in


Links in email messages don't work when they're viewed in Firefox browsers.


Mozilla is working on a fix for Firefox, but until then:

  1. Please use Microsoft Edge or another web browser.

  2. Use the beta. Learn more about the beta

  3. View email in the reading pane. For more information, read how to Change the look of your mailbox.


Some users are currently experiencing issues when reading email or composing new email when using Google Chrome with the AdBlock extension. 


  1. Use Microsoft Edge or another web browser.

  2. Exclude from the AdBlock settings. At the top right corner of Google Chrome, select AdBlock and then select Don’t run on pages on this domain. Refresh your browser to load again.


If email sync is slow, or you are not able to send or receive emails, this might be due to delays in syncing some connected accounts. We are aware of the issue and a fix will be released soon.


  • The "last update" time may not reflect the last time you received email from your connected account.

  • Disconnecting and reconnecting your connected account may not help syncing.


Use the free Mail for Windows 10 app to send and receive email from your connected account. Read how to Set up email in Mail for Windows 10

Outlook issues after connecting Outlook to


After connecting to Outlook for Windows (Outlook 2016, 2013, 2010 versions) to your email account, your may experience the following:

  • Your email account name shows up as outlook_[long series of letters and numbers] in the Folder Pane and when composing emails using Outlook for Windows.

  • Recipients will also receive the email from the sender with the outlook_[long series of letters and numbers] format.

  • When recipients reply to the email, the email bounces and you may receive the message “Undeliverable message when you send Internet mail in Outlook.”

This issue only impacts customers using Outlook for Windows. Emails sent via on the web works correctly and emails will be sent with the correct email address.


The Outlook client does not currently support using a non Microsoft domain primary alias. For the time being to get the account to work in Outlook you need to change the primary alias to a Microsoft domain account, such as or The Outlook Team is doing work that will enable some supported use of aliases in the near future. We will update this topic as soon as the functionality is available.


This issue occurs for users with multiple account aliases. We are actively working on a fix. In the meantime, to fix this issue, please do the following:

Note: If you do not have another alias, click the link on the page to create one "Click Add email and a new alias". Then choose the option "Create a new email address and add it as an alias"

  1. Go to and sign in to your account.

  2. Set your email as the primary alias.

  3. In Outlook for Windows, remove and re-add the account. See the steps in this article: Add your account in Outlook for Windows

Last updated: February 8, 2017


If Outlook is connected to a primary account that is also connected to other secondary non-Microsoft accounts (such as Gmail, Yahoo, etc.), when sending an email in Outlook, you are not able to choose the other secondary connected account as the "From" sending account.

If you manually type in the secondary connected account email address in the "From" field, the email is sent as "On behalf of" your primary account.


Outlook supports sending from a secondary connected account for Microsoft owned domains such as,, but has not implemented this functionality for third-party domains.

The Outlook team is listening to your feedback and investigating adding this functionality to future updates. Please vote up the request and add any feedback on UserVoice: Option to make Microsoft Outlook 2016 work with connected. In the meantime, please use the following workaround:


You can also add the secondary connected accounts (Gmail, Yahoo, etc.) in as additional accounts in the Outlook profile.

  1. In Outlook, choose the File tab.

    Screenshot of left section of Outlook ribbon with File selected
  2. Under Account Information, choose Add Account.

    Add Account command in the Backstage view
  3. On the Auto Account Setup page, enter your name, email address, and password, and then choose Next.

    Note: If you receive an error message after choosing Next, double check your email address and password. If both are correct, see the next section.

  4. Choose Finish.

For more information, please see Outlook email setup.

Last updated: May 2, 2017

Currently, you can't use Outlook on Windows to edit calendars that are shared with your account, even if you've reconnected your account to Outlook. We're working to make it possible to edit shared calendars in Outlook 2016 for Windows.

To edit a shared calendar, go online to your own calendar, open Calendar for Windows 10, or use a mobile device. Read how to Add your account to another mail app.

Last updated: May 2, 2017


When you try to accept a shared calendar using your Office 365 for business account in Outlook 2016, you might receive the "Something went wrong" error or your sign-in might fail.


To access the calendar shared with your Office 365 for business account, you’ll need to accept the invitation from Outlook on the web . If you've already clicked the Accept button in Outlook 2016, you won't be able to re-accept the invitation in Outlook on the web. The person who sent you the invitation will need to remove your permissions and then send a new invitation. "Something went wrong" error code 500

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