[US] Higher Latency for New and Updated Messages

<b>Mitigated</b> - Sync latencies for new and updated messages in the US region have returned to normal operating levels following the infrastructure changes implemented earlier.

We have mitigated the customer impact and are continuing to monitor performance while we investigate the unusually high notification traffic that contributed to the incident.

The EU region remains unaffected.

We have observed a large increase in notification traffic from Microsoft Graph today, which resulted in higher latencies for new and updated messages across providers in the US region.

We have made changes to our infrastructure to better handle the increased traffic, and latencies have reduced. We are continuing to monitor performance and investigate the source of the unusually high notification traffic.

The EU region is not affected.