I received this email notice also.  They seem to know the approx date I started using the email account, and that I use Roundcube.  I also use Thunderbird to read and send on the email account.  The scam looks pretty official, so I wanted to document it.  The scam text I received says,

We are closing down all outdated versions of the webmail and you are on an old version as of Wednesday, March 11, 2026.

Click the button below and sign in to get the latest version of the mailbox to avoid
being De-Activated on the current version.

UPGRADE NOW

and the link they want me to click goes to https://arogyapriya.com/wordpress/ilamer/com/

- Jim

Did you do any server updates like PHP or your web server? I wonder if dependence like that could be the cause of the issue.

Fresh install ... no change.

Longer version: I downloaded the complete version of 1.7-rc4, moved config/config.inc.php.sample to config/config.inc.php and set my db and smtp config parameters. I still have the same problem of headers not being shown on initial load of new messages.

What the heck could have happened???

I downloaded the complete package and ran the bin/installto.sh command, as per the upgrade instructions:

cd <the-unpacked-roundcube-directory>
bin/installto.sh <your-existing-roundcube-directory>
I will try a fresh install today and see if that fixes. Will report back.

When you updated Roundcube did you replace all the skin files? Did you install from the complete download or dependent version?

Good ideas, thank you for the suggestions.

Unfortunately I see the same behavior in Microsoft Edge, Google Chrome, and Firefox, all at latest version. No JS errors in the browser console.

Have you tried using another browser? Is there any errors in the browsers JS console?

Well, not fixed after all. Back to investigating. If anyone has any ideas for what to try I'm all ears!

This issue is now fixed.

For anyone else that comes across this, removing all files in the rouncubemail/temp/ directory fixed the issue:

rm -f rouncubemail/temp/*

Roundcube is open source webmail software it is not a service. It connects to your IMAP server similar to how Outlook does. The error you describe sounds a bit strange but Roundcube has is not involved at all when you are using Outlook. I suggest you contact your email provider and tell them the exact error message you get. They might ask you for the IMAP connection details you are using to confirm they are correct as well.