Legacy Outlook for Mac is now removing history when emails are replied or forwarded

RK 50

Hi All,

I use Outlook version 16.110 on a Mac (M2Pro) running MacOS Tahoe 26.5

After last Microsoft update, when i am replying or forwarding; i see history of the email chain is getting removed. This is not expected as we cant check the email to understand the full history.

In search i found another thread which talking the exact same issue. I tried to implement the recommendations given in this thread, but it did not fixed my issue. I tried to tag this issue in that. But i was advised to open a new thread, hence i am opening this thread.

I use Outlook Legacy mode as it offers browsing from one email to other emails using keyboard option (ctrl+[ / ctrl ] ) and this option does not work in newer look.

Please help me to fix this issue. Let me know if you need any more details about the issue. If needed i can show the issue in a zoom/team web call as well.

Reuben Rubio 5 Reputation points

2026-06-17T19:02:00.3466667+00:00

Reverting to 16.109.3 seems to have fixed the problem. Can I/we please ask that Microsoft do better QA on updates? At an affiliated organization where I know people, there was a Microsoft update this weekend on the Windows side that was buggy and made people backtrack the version. If you are going to suggest auto-updates, please make sure that updates do not steamroller prior capabilities. Attribution of prior email content in a thread is important. Thank you.

RR
MRA Admin 5 Reputation points

2026-06-17T21:07:44.7333333+00:00

Ugh!! Having the same issue. Can't roll back the app store version easily, and we have many users! Hopefully there will be a fix quickly!
Purple Tours 5 Reputation points

2026-06-18T10:25:28.9066667+00:00

Same issue- just on mac studio; Macbook all okay still. Can revert to the non-legacy version and solves the problem but much prefer legacy outlook :(
Phil M 0 Reputation points

2026-06-18T12:55:39.0133333+00:00

Microsoft needs to fix this issue. This is RIDICULOUS and is causing SERIOUS issues in our organization. Billion dollar company can't update without completely screwing something up. Joke.
Michael C 0 Reputation points

2026-06-18T16:53:16.42+00:00

Same issue here.
MARGARITA SANZ GONZÁLEZ 0 Reputation points

2026-06-19T11:17:28.1066667+00:00

Same problem here, messages disappear when replying. Please help with fixing this issue. Thanks!
Rodrigo Ditter Rodrigues 0 Reputation points

2026-06-19T17:10:50.7966667+00:00
Do we have any estimate on when an update to fix this issue will be released?
Laura Marier 5 Reputation points

2026-06-20T11:34:06.7066667+00:00

An easy workaround: When replying or forwarding: "select all" and copy the email you're replying to or forwarding. Then when you click reply or forward, paste the email you've copied into the message area. You can also keep track of the thread that way.
Kim@WSRefrA 0 Reputation points

2026-06-20T16:40:52.3733333+00:00

Travis,

Once I download 16.109.3, how do I revert Outlook back to this version and delete 16.110. Auto Update has been turned off. Thanks.
Diana Welch 0 Reputation points

2026-06-22T19:52:57.98+00:00

Same thing here. This is a serious problem to not show the original email thread. Microsoft needs a fix NOW. None of the suggested fixes work, and I am not savvy enough to go back to a previous OS without losing all of my data. I'm going to have to pay a technician to do this. RIDICULOUS
MQuin 10 Reputation points

2026-06-24T18:59:00.5366667+00:00

As of this afternoon, it seems to be fixed. I did not make any adjustments or applications - just waited out the fix. It is now working for me.
Phil M 0 Reputation points

2026-06-24T19:38:53.9166667+00:00

Not working here. Restarted my computer and still missing all information in the thread.
Laura Marier 5 Reputation points

2026-06-25T12:28:02.23+00:00

Same as @MQuin. It was fixed and didn't do a thing. Thank you!

Answer accepted by question author

Anonymous

Hi @RK and everyone,

Microsoft has rolled out version 16.110.1 on Current Channel. Please update your device to this version to fix the issue.

User's image

Thanks to everyone for being patience.

Charlie from Dover MA 0 Reputation points

2026-06-25T12:38:50.0566667+00:00

Hi Dora, MS Automatic update shows 110.1 for Excel, Powerpoint, and Word but shows 110 for Outlook. I am on 109 and that workaround is working based on your earlier post. This happens when I select Current Channel or Current Channel (Preview). What am I missing?

Thank you..
Anonymous

2026-06-26T02:30:01.9766667+00:00

Hi Charlie from Dover MA

You might want to try downloading and installing the Outlook 16.110.1 update package directly from the Office for Mac release history page, then check whether the issue is resolved.

Please let us know how it goes.

Best regards,
Chris Grimaldo 0 Reputation points

2026-06-26T12:47:23.1933333+00:00

This did not fix the issue.
Anonymous

2026-06-29T02:31:42.57+00:00

Hi Chris Grimaldo

If the issue persists after updating to Outlook version 16.110.1, I recommend contacting Microsoft Support for further investigation.

-For business accounts, you can raise a support ticket through the Microsoft 365 Admin Center by signing in and selecting Help & support. From there, you’ll be guided through submitting a request. Once the ticket is created, a Microsoft support agent can contact you directly. For further instructions, please refer to: Get support - Microsoft 365 admin | Microsoft Learn.

Please note that contacting Microsoft Support requires an active Microsoft 365 subscription and the appropriate admin role (such as Global Administrator). If you’re an end user, please reach out to your IT administrator to raise the request on your behalf.

-For personal accounts, you can contact Microsoft support by going to Microsoft Contact Us > Type "Support" and click Get Help > Click Sign in to contact Support at the bottom of the page. > Under products and Services, select Microsoft 365 and Office Option > Under category, select technical Support > Chat with a support agent in your web browser.

Thank you for your understanding.

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Solidarité Handicap 0 Reputation points

2026-06-22T12:27:00.01+00:00

As a temporary workaround, disabling Compose messages in HTML and When replying, keep original message format in Outlook composing setting fixes the problem - you lose HTML though...
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Travis Warner 0 Reputation points

2026-06-18T21:58:05.18+00:00

This was also an issue for me as well.

The below resource was the only way I reached a resolution.

Version 16.110 (26061317) was impacted.

Version 16.109.3 (26053122) was the last update before this change.

https://learn.microsoft.com/en-us/officeupdates/update-history-office-for-mac
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Jim G 134.1K Reputation points MVP

2026-06-23T02:30:14.0666667+00:00

This problem's fix was just released for testing to the beta channel in build 16.111 (26062117). If you are in the beta channel you should check for updates and install this build.

I don't know when the fix will reach Current Channel and Current Channel Preview.

I hope this at least lets you know that Microsoft is testing the fix right now and that it should reach everyone soon, assuming the fix doesn't break something else that's important. If you want to join the beta channel to get this fix, use the Help menu in Outlook and choose Check for Updates. This launches AutoUpdate. Click the Advanced button and change from Current Channel to Beta Channel. Let the updates install. Once installed, you can return to AutoUpdate and switch it back to Current Channel if you don't want to keep getting beta builds. You won't lose the current beta build, but you won't get updates until you catch up to the Current Channel cycle (about 2 months).

Note: not everyone has permission to switch to beta channel. If beta channel is not available to you, then either just wait patiently for the next Current Channel update or revert to an older version.
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AI answer

2026-06-13T02:21:11.91+00:00
The described behavior matches a known issue where message content or headers are truncated when replying or forwarding in some Outlook for Mac builds. These issues have been addressed in later updates of Outlook for Mac.

To resolve the problem where history is removed when replying or forwarding in Legacy Outlook for Mac:

Update Outlook for Mac to the latest available build for the channel in use. Several reply/forward and header‑truncation issues have been fixed in newer versions, for example:

A fix for truncated reply/forward headers in certain languages in build 16.20 (181208).

Multiple fixes to reply/forward behavior and plain‑text handling in later 16.xx builds, as reflected in the release notes.

After updating, restart Outlook and test reply/forward on a new message chain to confirm that the full conversation history is preserved.

If the issue persists after updating to the latest build, create a new Outlook profile and re-add the account, then test again. Corrupted profiles can cause unexpected reply/forward behavior.

If still affected, consider switching from Legacy Outlook for Mac to the new Outlook for Mac client, as Legacy Outlook is in maintenance mode and will reach end of support against Exchange Online in October 2026. The new client receives the most up-to-date fixes and feature improvements.

If blocked from accessing required features or updates, contact Microsoft support for assistance, as recommended for customers impacted by Legacy Outlook limitations.

References:

Subject and Recipient headers do not appear in some language versions of Outlook for Mac

Outlook for Mac - Release notes for Beta Channel builds

End of support for legacy Outlook for Mac

Fixes or workarounds for recent issues in Outlook for Mac
AI-generated content may be incorrect. Read our transparency notes for more information.
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RK 50 Reputation points

2026-06-25T05:52:03.3133333+00:00

Hi,

After upgrade issue is fixed. Few of my friends who has same issue finding slowness in the Auto upgrade, it is processing last 12 hours for them. still not upgraded.
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Anonymous

2026-06-25T08:15:23.4+00:00

Hi RK

Thank you for the update.

I'm glad to hear that updating Outlook resolved the issue for you.

Regarding your colleagues, they may want to wait a little longer and try checking for updates again later.

Best regards,
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Legacy Outlook for Mac is now removing history when emails are replied or forwarded

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