If you use Time Machine with a network backup volume (such as a Time Capsule disk or an AFP share from another computer) in Mac OS X 10.5.3 or later, "Backup volume could not be mounted" may appear in Time Machine preferences and back up attempts may not work. This may happen if the password for the network backup volume has changed since Time...

When binding a Mac OS X client to Active Directory, it is important to ensure that the computer names used in the binding process are less than 16 characters and use valid characters for Active Directory computer account names. Entering a longer computer name or invalid characters may cause client binding to Active Directory to not work, or cause...

When attempting to send a message in Mail that has been signed by a trusted certificate, a message may briefly appear that states: "Unable to sign message You don’t have a trusted certificate in your keychain that matches the email address (sender’s email address). Without a certificate, you can’t sign messages sent from this...

When Lion is installed on a software RAID set, Disk Utility may not be able to verify or repair volume permissions. The process appears to start but immediately stops....

This document describes the security content of Java for OS X 2012-004 and Java for Mac OS X 10.6 Update 9....

This document describes the security content of iTunes 10.6.3....

Learn how DVD Player in OS X uses DVD-Video disc region codes....

This document describes the security content of Leopard Security Update 2012-003....

This document describes the security content of Safari 5.1.7....

In OS X Lion v10.7.3, user account passwords for Legacy FileVault and/or home folders mounted via NFS, AFP, or SMB are stored as plain text in log files. System backups and syslog servers may also have the user account passwords stored as plain text. Note: Time Machine backups are not affected—Time Machine does not back up the log files...