The latest updates to Exchange 2010 and 2013 were posted 9/15/2015.
- Exchange 2010: Download SP3 UR 11 | KB3078674
- Exchange 2013: Download CU10 | KB3078678 | Download CU10 Language Packs
Exchange Team EHLO Blog Post: Released: September 2015 Quarterly Exchange Updates.
Like the previous CUs for 2013, this is a full install and upgrade. CUs are supported for three months after the next CU comes out, so CU9 support ends on 11/15/2015 now. See the EHLO post: Servicing Exchange 2013 for more details.
O365 Hybrid customers are required to be running the most current CU, so test CU10 in your labs and then upgrade ASAP. Exchange 2013 CUs cannot be uninstalled or rolled back, so test the latest CU in your lab with any Exchange integrated applications.
Exchange 2010 SP3 Update Rollup 11 includes an important fix for Information Store crashes for customers who are also upgrading from Lync to Skype for Business.
These updates will also be required for coexistence and upgrade support to Exchange 2016. Exchange 2007 will not be supported, for coexistences and migration to Exchange 2016. So if you are on Exchange 2007 still and want to goto 2016 you need to upgrade 1st to 2010 or 2013, or look into 3rd party tools. Bit more details on this topic on Tony Redmond’s post here: Updates lay the foundation for the launch of Exchange 2016
For more details see the EHLO blog post, 2010 KB3078674, and 2013 KB3078678.
Can a system on 2010 RU5 go directly to RU10?
Yes, supported but not tested.