Some users may see older draft email messages appear as recently modified in Exchange Online

Title: Some users may see older draft email messages appear as recently modified in Exchange Online User impact: Users may have seen older draft email messages appear as recently modified in Exchange Online. More info: Users may have noticed that previously created draft email messages appeared with a recent modification date, even when no visible changes have been made. This behavior affected multiple draft items, where older drafts appeared as if they were modified recently, leading to confusion when trying to determine when a draft was originally created or last edited. Final status: We’ve confirmed that our deployment has completely saturated to all affected environments and verified through service health telemetry that this has successfully remediated the impact. Scope of impact: Some users attempting to view draft email messages in Exchange Online may have been impacted. Start time: Friday, May 15, 2026, at 5:07 AM UTC End time: Tuesday, May 26, 2026, at 10:00 PM UTC Root cause: Annotation-only workload updates were incorrectly updating the LastModificationTime property on draft email messages, causing draft email messages to have been incorrectly updated and resulted in older drafts appearing as recently modified in users’ mailboxes. Next steps: - We're reviewing the impacting workload flow to better understand the source of the issue in an effort to prevent similar future occurrences. This is the final update for the event.

Title: Some users may see older draft email messages appear as recently modified in Exchange Online User impact: Users may see older draft email messages appear as recently modified in Exchange Online. More info: Users may notice that previously created draft email messages appear with a recent modification date, even when no visible changes have been made. This behavior can affect multiple draft items, where older drafts appear as if they were modified recently, leading to confusion when trying to determine when a draft was originally created or last edited. Current status: We’ve confirmed that 90 percent of the deployment has saturated across the affected environments, and some users may experience alleviation as saturation progresses. We’re continuing to monitor service behavior while the mitigation rollout continues and investigating inconsistencies affecting a subset of traffic to determine an alternate approach that fully addresses the issue, which will help us ensure all affected users receive the fix. Scope of impact: Some users attempting to view draft email messages in Exchange Online may be impacted. Root cause: Annotation-only updates performed by the specific workload is incorrectly updating the LastModificationTime property on draft email messages, causing draft email messages to be incorrectly updated and resulting in older drafts appearing as recently modified in users’ mailboxes. Next update by: Wednesday, May 27, 2026, at 1:30 AM UTC

Title: Some users may see older draft email messages appear as recently modified in Exchange Online User impact: Users may see older draft email messages appear as recently modified in Exchange Online. More info: Users may notice that previously created draft email messages appear with a recent modification date, even when no visible changes have been made. This behavior can affect multiple draft items, where older drafts appear as if they were modified recently, leading to confusion when trying to determine when a draft was originally created or last edited. Current status: We’ve confirmed that 90 percent of the deployment has saturated across the affected environments, and some users may experience alleviation as saturation progresses. We’re continuing to monitor service behavior while the mitigation rollout continues and investigating inconsistencies affecting a subset of traffic to determine an alternate approach that fully addresses the issue, which will help us ensure all affected users receive the fix. Scope of impact: Some users attempting to view draft email messages in Exchange Online may be impacted. Root cause: Annotation-only updates performed by the specific workload is incorrectly updating the LastModificationTime property on draft email messages, causing draft email messages to be incorrectly updated and resulting in older drafts appearing as recently modified in users’ mailboxes. Next update by: Wednesday, May 27, 2026, at 1:30 AM UTC

Title: Some users may see older draft email messages appear as recently modified in Exchange Online User impact: Users may see older draft email messages appear as recently modified in Exchange Online. More info: Users may notice that previously created draft email messages appear with a recent modification date, even when no visible changes have been made. This behaviour can affect multiple draft items, where older drafts appear as if they were modified recently, leading to confusion when trying to determine when a draft was originally created or last edited. Current status: We’re continuing to monitor service behaviour while mitigation rollout progresses and are investigating inconsistencies impacting a subset of traffic to identify an alternate approach to fully address the issue and ensure all affected users receive the fix. Scope of impact: Some users attempting to view draft email messages in Exchange Online may be impacted. Root cause: Annotation-only updates performed by the specific workload is incorrectly updating the LastModificationTime property on draft email messages, causing draft email messages to be incorrectly updated and resulting in older drafts appearing as recently modified in users’ mailboxes. Next update by: Tuesday, May 26, 2026, at 7:30 PM UTC

Title: Some users may see older draft email messages appear as recently modified in Exchange Online User impact: Users may see older draft email messages appear as recently modified in Exchange Online. More info: Users may notice that previously created draft email messages appear with a recent modification date, even when no visible changes have been made. This behaviour can affect multiple draft items, where older drafts appear as if they were modified recently, leading to confusion when trying to determine when a draft was originally created or last edited. Current status: We’re continuing to monitor service behaviour while mitigation rollout progresses and are investigating inconsistencies impacting a subset of traffic to identify an alternate approach to fully address the issue and ensure all affected users receive the fix. Scope of impact: Some users attempting to view draft email messages in Exchange Online may be impacted. Root cause: Annotation-only updates performed by the specific workload is incorrectly updating the LastModificationTime property on draft email messages, causing draft email messages to be incorrectly updated and resulting in older drafts appearing as recently modified in users’ mailboxes. Next update by: Tuesday, May 26, 2026, at 7:30 PM UTC

Title: Some users may see older draft email messages appear as recently modified in Exchange Online User impact: Users may see older draft email messages appear as recently modified in Exchange Online. More info: Users may notice that previously created draft email messages appear with a recent modification date, even when no visible changes have been made. This behaviour can affect multiple draft items, where older drafts appear as if they were modified recently, leading to confusion when trying to determine when a draft was originally created or last edited. Current status: We're continuing to monitor service telemetry while we disable the aforementioned offending feature. We expect this to be complete by our next scheduled update. Scope of impact: Some users attempting to view draft email messages in Exchange Online may be impacted. Root cause: Annotation-only updates performed by the specific workload is incorrectly updating the LastModificationTime property on draft email messages, causing draft email messages to be incorrectly updated and resulting in older drafts appearing as recently modified in users’ mailboxes. Next update by: Tuesday, May 26, 2026, at 2:30 PM UTC

Title: Some users may see older draft email messages appear as recently modified in Exchange Online User impact: Users may see older draft email messages appear as recently modified in Exchange Online. More info: Users may notice that previously created draft email messages appear with a recent modification date, even when no visible changes have been made. This behaviour can affect multiple draft items, where older drafts appear as if they were modified recently, leading to confusion when trying to determine when a draft was originally created or last edited. Current status: We’ve identified an issue where a feature intended to handle annotation-only updates is affecting draft email messages, causing some drafts to appear as recently modified when no meaningful changes were made. We’re mitigating the impact by disabling this feature and deploying the fix across the service. We’re actively monitoring service health and telemetry to confirm the effectiveness of this mitigation and ensure impact is decreasing. Scope of impact: Some users attempting to view draft email messages in Exchange Online may be impacted. Root cause: Annotation-only updates performed by the specific workload is incorrectly updating the LastModificationTime property on draft email messages, causing draft email messages to be incorrectly updated and resulting in older drafts appearing as recently modified in users’ mailboxes. Next update by: Tuesday, May 26, 2026, at 12:30 PM UTC

Title: Some users may see older draft email messages appear as recently modified in Exchange Online User impact: Users may see older draft email messages appear as recently modified in Exchange Online. More info: Users may notice that previously created draft email messages appear with a recent modification date, even when no visible changes have been made. This behaviour can affect multiple draft items, where older drafts appear as if they were modified recently, leading to confusion when trying to determine when a draft was originally created or last edited. Current status: We’ve identified an issue where a feature intended to handle annotation-only updates is affecting draft email messages, causing some drafts to appear as recently modified when no meaningful changes were made. We’re mitigating the impact by disabling this feature and deploying the fix across the service. We’re actively monitoring service health and telemetry to confirm the effectiveness of this mitigation and ensure impact is decreasing. Scope of impact: Some users attempting to view draft email messages in Exchange Online may be impacted. Root cause: Annotation-only updates performed by the specific workload is incorrectly updating the LastModificationTime property on draft email messages, causing draft email messages to be incorrectly updated and resulting in older drafts appearing as recently modified in users’ mailboxes. Next update by: Tuesday, May 26, 2026, at 12:30 PM UTC

Title: Some users may see older draft email messages appear as recently modified in Exchange Online User impact: Users may see older draft email messages appear as recently modified in Exchange Online. More info: Users may notice that previously created draft email messages appear with a recent modification date, even when no visible changes have been made. This behaviour can affect multiple draft items, where older drafts appear as if they were modified recently, leading to confusion when trying to determine when a draft was originally created or last edited. Current status: We’re analyzing reported behaviour to better understand the issue and to determine the cause of impact. Scope of impact: Impact is specific to some users attempting to view draft email messages in Exchange Online. Root cause: Annotation-only updates performed by the specific workload is incorrectly updating the LastModificationTime property on draft email messages, causing draft email messages to be incorrectly updated and resulting in older drafts appearing as recently modified in users’ mailboxes. Next update by: Tuesday, May 26, 2026, at 10:30 AM UTC