Users may be unable to view the body of edited Exchange Online email messages from the Sent folder

Title: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder User impact: Users may have been unable to view the body of edited Exchange Online email messages from the Sent folder. More info: When a user opened and edited an email message in the draft folder, sent it, and then viewed it from their sent folder, the edited portion may have appeared blank in the message preview. Impact only occurred for users utilizing the "Show email as individual messages" Message organization setting. While we worked on mitigating this issue, users could utilize the "Show email grouped by conversation" message organization setting to avoid this issue. Final status: We've completed the deployment of our fix and confirmed through testing with a subset of affected users that the impact has been remediated. Scope of impact: Users attempting to view the body of edited Exchange Online email messages from the Sent folder may have been impacted. Start time: Wednesday, April 15, 2026, at 10:36 AM UTC End time: Friday, June 05, 2026, at 7:18 PM UTC Root cause: A code issue occurred when an email message was saved to drafts and it created a local copy. When a user edited the email message in drafts, sent it, and then viewed the email message from their sent folder, it attempted to reference the stale local copy instead of the edited version. As a result, the attempt to fetch the body failed and caused impact. Next steps: - We're reviewing the offending code issue to determine how it was introduced into the service, so that we can prevent similar instances of impact from occurring in the future. This is the final update for the event.

Title: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder User impact: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder. More info: When a user opens and edits an email message in the draft folder, sends it, and then views it from their sent folder, the edited portion may appear blank in the message preview. Impact only occurs for users utilizing the "Show email as individual messages" Message organization setting. While we work on mitigating this issue, users can utilize the "Show email grouped by conversation" message organization setting to avoid this issue. Current status: We've developed a code fix to address this issue and anticipate it will complete its deployment by our next scheduled update, at which point we'll look to confirm remediation with a subset of affected users. Scope of impact: Users attempting to view the body of edited Exchange Online email messages from the Sent folder may be unable to do so. This is subject to change as our investigation continues. Start time: Wednesday, May 20, 2026, at 11:12 PM UTC Root cause: A code issue occurs when an email message is saved to drafts and it creates a local copy. When a user edits the email message in drafts, sends it, and then views the email message from their sent folder, it attempts to reference the stale local copy instead of the edited version. As a result, the attempt to fetch the body fails and causes impact. Next update by: Friday, June 05, 2026, at 10:30 PM UTC

Title: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder User impact: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder. More info: When a user opens and edits an email message in the draft folder, sends it, and then views it from their sent folder, the edited portion may appear blank in the message preview. Impact only occurs for users utilizing the "Show email as individual messages" Message organization setting. While we work on mitigating this issue, users can utilize the "Show email grouped by conversation" message organization setting to avoid this issue. Current status: We've identified that a local copy when an email message is being saved in the Drafts folder. When a user edits the email message through Drafts, sends it, and then views the email message from their Sent folder, it attempts to reference the stale local copy instead of the edited version. As a result, the attempt to fetch the body fails and causes impact. We're exploring our options to develop the most effective fix. Scope of impact: Users attempting to view the body of edited Exchange Online email messages from the Sent folder may be unable to do so. This is subject to change as our investigation continues. Root cause: A code issue occurs when an email message is saved to drafts and it creates a local copy. When a user edits the email message in drafts, sends it, and then views the email message from their sent folder, it attempts to reference the stale local copy instead of the edited version. As a result, the attempt to fetch the body fails and causes impact. Next update by: Tuesday, May 26, 2026, at 10:30 PM UTC

Title: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder User impact: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder. More info: When a user opens and edits an email message in the draft folder, sends it, and then views it from their sent folder, the edited portion may appear blank in the message preview. Impact only occurs for users utilizing the "Show email as individual messages" Message organization setting. While we work on mitigating this issue, users can utilize the "Show email grouped by conversation" message organization setting to avoid this issue. Current status: We've narrowed down that impact only occurs for users utilizing the "Show email as individual messages" Message organization setting. While we work on mitigating this issue, users can utilize the "Show email grouped by conversation" Message organization setting to avoid this issue. From the collected client logs, we've found that a request call responsible for fetching the message body is missing, which indicates a potential issue with stale data. We're checking whether recent service changes may be contributing to this impact. Scope of impact: Users attempting to view the body of edited Exchange Online email messages from the Sent folder may be unable to do so. This is subject to change as our investigation continues. Next update by: Friday, May 22, 2026, at 9:30 PM UTC

Title: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder User impact: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder. More info: When a user opens and edits an email message in the draft folder, sends it, and then views it from their sent folder, the edited portion appears blank in the message preview. Current status: Our review of the HAR logs that were provided by a subset of users remained inconclusive, so we reproduced the impact using our internal testing environment. After collecting client logs from our reproduction, we're analyzing the call requests to identify any abnormalities that may help us identify why the item's message body is truncated. Scope of impact: Users attempting to view the body of edited Exchange Online email messages from the Sent folder may be unable to do so. This is subject to change as our investigation continues. Next update by: Friday, May 22, 2026, at 7:30 PM UTC

Title: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder User impact: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder. Current status: We're continuing our investigation of HTTP Archive logs and reproductions of this incident to help understand the root cause of impact and a mitigation plan. Scope of impact: Users attempting to view the body of edited Exchange Online email messages from the Sent folder may be unable to do so. This is subject to change as our investigation continues. Next update by: Friday, May 22, 2026, at 5:30 PM UTC

Title: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder User impact: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder. Current status: We're investigating HTTP Archive logs and reproductions of this incident from a subset of impacted users to isolate the underlying cause to determine our troubleshooting steps. Scope of impact: Users attempting to view the body of edited Exchange Online email messages from the Sent folder may be unable to do so. This is subject to change as our investigation continues. Next update by: Friday, May 22, 2026, at 9:30 AM UTC

Title: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder User impact: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder. Current status: We're gathering needed diagnostic data to begin our investigation to isolate the source of impact and determine our next steps. Scope of impact: Users attempting to view the body of edited Exchange Online email messages from the Sent folder may be unable to do so. This is subject to change as our investigation continues. Next update by: Friday, May 22, 2026, at 6:00 AM UTC

Title: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder User impact: Users may be unable to view the body of edited Exchange Online email messages from the Sent folder. Current status: We're investigating a potential issue with Exchange Online and checking for impact. We'll provide an update within 30 minutes. Next update by: Friday, May 22, 2026, at 3:55 AM UTC