Apple recently seeded the fourth OS X 10.9.2 to developers with minor changes. The Cupertino California emphasizes its focus on Mail, Messages and VPN services. The latest Mavericks beta build 13C48 comes one week after Apple released the third beta version of the upcoming OS X 10.9.2 maintenance update to developers in mid-January.

According to the accompanying release notes, Apple is still focusing on Mail and Messages, two built-in features that seemed to have caused many problems for many users since Mavericks first launched in October. Those affected have complained of Gmail compatibility issues and erratic Smart Mailbox behavior.

In addition to the Mail and Messages apps, Apple requested developers to test server message block (SMB2), graphics drivers, VoiceOver and VPN services. The Cupertino California company switched from AFP file sharing to SMB2 with Mavericks in an effort to enhance performance, security and cross-platform compatibility.

Developers can download the new build via Software Update or via Apple’s developer Web portal.

Source: Apple