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However, the pre-header will populate in other email platforms like Gmail, Yahoo, MacOS Outlook Client, Outlook Web Client, etc.
Microsoft forum that outlines the issue: https://answers.microsoft.com/en-us/outlook_com/forum/all/preview-preheader-text-missing-bug/03c560fb-a00c-44c1-8b33-42bc519d3373
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Locate a email creative (template) that contains a pre-header
Send yourself a test email using a Sparkpost adapter using your work email (Outlook) AND to a non-Windows Outlook client mailbox such as Gmail or Yahoo
Confirm that you received the mailings in your inboxes
The Windows Outlook client should not contain the pre-header
The non-Outlook mailbox should contain the pre-header
Repeat steps 1-3 using a Momentum adapter instead of Sparkpost
The pre-header should populate in both the Windows Outlook client and the non-Windows Outlook client mailbox
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Linked Issues
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