Exchange 2010 SP3 Rollup 26

Update Rollup 26 for Exchange 2010 Service Pack 3 is now available. It contains 3 documented new security updates and all previously released fixes and security updates for Exchange 2010 SP3. Note that mainstream support for Exchange 2010 has already ended.

View: Description of Update Rollup 26 for Exchange Server 2010
Download: Update Rollup 26 For Exchange 2010 SP3 (KB4487052)
View: Blog post of the Exchange Team about CU26 for Exchange Server 2010