: Resolved bugs where outgoing server information might be missing and fixed issues preventing mailboxes from displaying correctly.

OS X El Capitan 10.11.1 was released on October 21, 2015, as a refinement-focused update to the Mac operating system. While it maintained the design aesthetic of its predecessor, Yosemite, it introduced critical stability fixes and minor feature additions that improved the overall user experience.

: Improved stability when upgrading from older OS versions and fixed issues with Microsoft Office 2016 .

The primary goal of this update was to address early bugs found in the initial El Capitan release and to enhance compatibility with newer software.

As part of the broader El Capitan series, 10.11.1 includes these foundational features: How To Change Default System Font in El Capitan