Users running a breadth of Microsoft Exchange Server versions received updates this week. The company has rolled out updates for Exchange Server 2016, 2013, 2010, and 2007. Each of these releases is a cumulative update, while update rollups were also launched to some ES builds on Tuesday. Microsoft has explained each cumulative and rollup on its blog. In terms of cumulative updates (CU), the company has sent out CU4 for Exchange 2016 and CU15 for Exchange 2013. Update rollups (RU) offered were RU16 for Exchange 2010 Service Pack 3 and RU22 for Exchange Server 2007 SP3. There is one key difference between a cumulative update and an update rollup. The rollup patches simply bring a security patch rolled into a general update. Cumulative updates are arguably more familiar and are full server releases that come without a security update, which arrives separately. Why Microsoft opted for one or the other is unclear and is probably unimportant. What is important is the specifics of each of the new updates, starting with the latest version of Microsoft's mail and calendaring service, Exchange Server 2016.
Microsoft Updates Exchange Server 2016 and Legacy Versions
The company has sent out cumulative updates and update rollups for the last four versions of Exchange Server, including Exchange 16. The releases focus on clearing up problems from previous roll outs.