exchange online uptime

Additionally, there are a number of cases outlined in the SLA provided by Microsoft that would mean that 99.9% uptime promise is not applicable, and therefore, not financially backed. Exchange Online offers many different reports that can help you determine the overall status and health of your organization. ReFS is a file system in Windows Server 2012 and later that is designed to be more resilient against data corruption thereby maximizing data availability and integrity. Because MRS is a component of Exchange Online, we can make changes in its code to address new forms of corruption that are detected in the future. A lost flush occurs when a database write operation that the disk subsystem/operating system returned as completed did not actually get written to disk, or was written in the wrong location. This is accomplished by putting a request for the page into the log stream, which is the basis of mailbox database replication. These consistency checks prevent physical corruption from being replicated by the system. Message data aggregation is mostly complete within 24-48 hours. With Shadow Redundancy, each Exchange Online transport server makes a copy of each message it receives before it acknowledges successfully receiving the message to the sending server. While information has been available in detail for our current customers, today we’re making this information available to all customers considering Office 365. In addition, the log file header is examined to make sure the log file signature recorded in the log header matches that of the log file. For example, if we detect a consistency issue that MRS is not able to fix, we can analyze the corruption, change the MRS code and correct the inconsistency (if we understand how to). For example, one report lists the number of groups created and deleted by day, week, month, or year. View your Microsoft 365 Service health. These reports provide summary data and the ability to drill down into details about individual messages. Some minor incremental aggregated changes may occur for up to 5 days. These reports help you meet regulatory, compliance, and litigation requirements. Microsoft Exchange Online offers a variety of reporting features both in and out of the Exchange admin center (EAC). Lagged database copies in Exchange Online are configured with a seven-day log file replay lag time. For detail data that's less than 7 days old, data should appear within 24 hours but may not be complete until 48 hours. In addition to these native features, Exchange Online also includes data resiliency features that customers can manage, such as: Every mailbox database in Microsoft 365 is hosted in a database availability group (DAG) and replicated to geographically-separate datacenters within the same region. For a mapping of reports from the old Microsoft 365 admin center, see Where did my report go? Protection against corruption of mailbox data in Exchange Online is achieved by using Exchange Native Data Protection, a resiliency strategy that leverages application-level replication across multiple servers and multiple datacenters along with other features that help protect data from being lost due to corruption or other reasons. This lets you efficiently answer your users' questions and troubleshoot mail flow issues, and alleviates the need to contact technical support for assistance. The fourth copy is configured as a lagged database copy. Exchange Online customers can access reports in the Microsoft 365 admin center, by downloading an Excel reporting workbook, or by using web services.

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