Using classic Outlook for Windows in business environments
If the Outlook message background or embedded background image stopped applying after updates in classic Outlook, first determine which symptom matches the issue:
- Background or stationery settings are no longer applied to messages
- In Outlook, go to File > Options > Mail.
- Open Stationery and Fonts.
- Check whether a theme or stationery is still selected.
- If needed, reapply the theme or remove it and apply it again.
- For individual messages, background changes are supported through message background options such as color, gradients, textures, or pictures.
- Images in the message body or signature are not rendering
A known issue affected classic Outlook after the May 12, 2026 updates where images in emails, newsletters, or signatures were not displayed.
- Open the affected email in classic Outlook.
- On the ribbon, select Move > Actions > Other Actions > View Source.
- Search for
cidinside thesrcattribute in av:imagedatatag, for examplesrc=cid:image001.png.... - If present, the message matches that known issue.
- Resolution for the known image/background rendering issue
- The issue is marked fixed.
- Install a Microsoft 365 Apps build that contains the fix.
- If the current update channel does not yet have the fixed build, the fix was expected with the June 9 public updates.
- Replies or forwards created while the image was missing may permanently lack that image.
- If the issue is only on replies or forwards Outlook can remove or replace customized stationery and color backgrounds on replies and forwards. New stationery or themes cannot be applied on replies or forwards, but custom fill effects can be used to approximate stationery effects.