If you are having problems with your email, one common diagnostic aid is a complete list of the message's headers. Headers show the path a message took to get from the sender to the recipient. The IT Service Desk or other technical support may ask you to provide a message's headers.
Outlook 2016 for Mac, the latest iteration of the email and calendaring app, is a worthwhile upgrade for existing users. But if you don't already use Outlook, the new edition probably won't offer. Tip: The 64-bit version is installed by default unless Office detects you already have a 32-bit version of Office (or a stand-alone Office app such as Project or Visio) installed.In this case, the 32-bit version of Office will be installed instead. To change from a 32-bit version to a 64-bit version or vice versa, you need to uninstall Office first (including any stand-alone Office apps you. More than just email. Outlook for Mac now syncs your Google calendars and contacts. Get it free for the first year with your subscription to Outlook.
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- Right-click (or ctrl-click) the message in your Inbox or other folder (do not open the message).
- From the menu that appears, select View Source.
Your text editor (typically an application called TextEdit) will open, displaying all the headers for the message, followed by the message body.
If you need to copy the headers (to paste somewhere else),
- Drag over the text from the beginning of the text to the beginning of the body of the message.
- Press command-c on your keyboard; this copies the highlighted text to the clipboard.
- Then, with an email message or other document open, press command-v to paste the header text into that document.
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Symptoms
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In Microsoft Outlook 2016 for Mac, you are repeatedly prompted for authentication while you're connected to your Office 365 account.
Cause
This issue occurs because of the presence of duplicate tokens in the keychain.
Resolution
To resolve this issue in Outlook 2016 for Mac, install the February 2017 Outlook update (version 15.31.0) from the following Office website:
Workaround
To work around this issue, delete any cached passwords for your account, and also delete any modern authentication tokens from the keychain. To do this, follow these steps.
Note
These steps affect all Office applications that use modern authentication.
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- Quit Outlook and all other Office applications.
- Start Keychain Access by using one of the following methods:
- Select the Finder application, click Utilities on the Go menu, and then double-click Keychain Access.
- In Spotlight Search, type Keychain Access, and then double-click Keychain Access in the search results.
- In the search field in Keychain Access, enter Exchange.
- In the search results, select each item to view the Account that's listed at the top, and then press Delete. Repeat this step to delete all items for your Exchange account.
- In the search field, enter adal.
- Select all items whose type is MicrosoftOffice15_2_Data:ADAL:<GUID>, and then press Delete.
- In the search field, enter office.
- Select the items that are named Microsoft Office Identities Cache 2 and Microsoft Office Identities Settings 2, and then press Delete.
- Quit Keychain Access.NoteWhen you start Outlook, you are prompted to authenticate.