My Outlook for Mac HTML email reply quoted body blank, only headers show

I've been using Legacy Outlook for Mac for years without issues, but since Wednesday afternoon (June 17, CET) something broke after the latest update rolled out.

When I reply to any HTML email, the quoted original message is completely blank. Only the From, Date, To and Subject headers show up — the actual email body is gone. It makes it impossible to have a proper email thread because the recipient can't see the conversation history.

This started right after Version 16.110 (Build 26061317) was released on June 16, 2026. The release notes only mention "Quality and performance improvements" for Outlook, so whatever changed in this build seems to have broken HTML reply quoting as an unintended side effect.

My setup:

• MacBook Air M5, macOS
• (Legacy Outlook for Mac
• Exchange on-premises account (EWS), domain login

What I'm experiencing:

• Replying in HTML mode → quoted body is completely blank, only headers show
• Switching to plain text → body comes back but with massive blank line gaps throughout (not professional to send)
• Outlook Web (OWA) → works perfectly fine

What I've already tried:

• Cleared app data (Document Cache + Experimental Features) — no fix
• Cleared Outlook cache manually — no fix
• Toggled composing settings — no fix
• Checked settings in Preferences → Email → Composing — everything looks correct

I've also tested Apple Mail as an alternative but it breaks embedded signature images (CID images show as placeholders), and it doesn't support Teams meeting integration — so going back to Legacy Outlook is really the only option for my daily work.

Outlook Web App OWA is my current workaround but it's not sustainable long term. I really hope this can be looked at as a regression fix in the next update. Has anyone else experienced this since the June 16 build?

Does anyone has this issue as well?