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Apple improves Mail compatibility with Gmail, and fixes other security and compatibility issues in the first update to Mavericks, OS X 10.9.1.
When you download application installers and other files from the Internet, you may see a verification checksum associated with it. Here is how to use that number.
If you would like to verify two copies of files or two mirrored directories, there are some Terminal commands that will let you do just that.
Apple has released OS X 10.6.6, which brings some stability and bug fixes but mainly adds support for Apple's newly released Mac App Store for OS X.
Sometimes software installations may fail in OS X, which can be caused by faults with the installation media or by improper system set-ups.