Image 1 Expand Figure 1: Running ESEUTIL (image credit: Tony Redmond) All in all, the ESE developers have been busy! In addition to user, group, shared, room, and other mailbox types, Exchange Online storage is the backbone of the Microsoft 365 substrate, which stores “digital twins” of information gathered from multiple workloads to make services like Search work. Hundreds of millions of Office 365 and users depend on ESE to get work done. Today, Exchange 2019 and Exchange Online servers run a very different and much-developed ESE capable of supporting stretched Database Availability Groups (DAGs) with database copies deployed over up to sixteen servers. Reducing the cost of storage was an important influence over the economics of Microsoft’s cloud. Microsoft then invested in driving down the I/O profile of Exchange from the heavyweight demands of Exchange 2003 to be able to run on JBOD. That work concluded that ESE was a better option for the kind of transactions a mail server processes. SharePoint later moved to SQL and an engineering effort (project “Kodiak”) also considered moving Exchange to SQL around the Exchange 2003 timeframe. The original implementation of SharePoint (code name “Tahoe” or SharePoint Portal Server 2001) used ESE too. The Evolution of ESEĮxchange 4.0 used ESE for its sole 16 GB mailbox database.
EDB files, including Spartan.edb, apparently used by the Edge browser for backups. Although Microsoft isn’t accepting suggestions to improve the code for now, they say that they’ll accept contributions in the future.ĮSE (aka “Jet Blue”) is most closely linked with Exchange, but it’s featured in many other Microsoft products, including Active Directory. Fans of the non-SQL database engine, which has powered every version of Exchange since the initial 4.0 release twenty-five years ago, now have the chance to peruse the ESE code. In a surprise development, Microsoft has released the source code for the Extensible Storage Engine (ESE) on GitHub.
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