I'd also like to see Windows 10 default Mail client in previews.
:) Well, I guess you are right. I have to get my eyes checked I think.
Thanks Mark!
Sorry, Outlook desktop programs, NOT Outlook.com.
Started a new discussion: Conditional Code for Outlook - Windows Only?
OK, with some help from my friends from Stack Exchange, this is solved.
The way to solve this is similar to the way we add pre-header text everywhere else - it just needs to be Outlook specific.
This solved it for me:
<div style="font-size: 1px; line-height: 1px; display: none !important; mso-hide: all;">Add pre-header text here. Make sure you have a lot of text since the default Outlook 365 preview is 3 lines.</div>
Started a new discussion: Outlook message preview when sending from Outlook
Lucy, you solved my issue! Thanks a lot!
Fantastic! This just saved me a few hours.