In my case, this conversion had side effects. Mail “Assertion failure” messages in ConsoleĪfter installing Mavericks and opening Mail all messages are'converted.” What happens in this conversion is unknown, but it is a common occurrence with Mail and OS X upgrades. Install system data files and security updates.If you want complete control of installing software updates on your Mac, I recommend deselecting the following two settings in App Store preferences: Deselecting Wake for network access solved this issue. Mavericks assumes one is using features related to Wake on Demand and the Bonjour Sleep Pro xy, which I am not. I realized that installing Mavericks enabled the Wake for network access preference in Energy Saver preferences. My Mac Pro periodically woke up - just the computer, not the display - after installing Mavericks. Deselecting Documents & Data stopped the prompt for my Apple ID. I traced the source of this problem to iCloud preferences: installing Mavericks enabled the Documents & Data option, which I do not use. After installing Mavericks, logging in to my account resulted in a prompt for my Apple ID, followed by an animation indicating a set up procedure. Persistent prompt for Apple ID when logging in.Two post-installation issues I encountered were the result of the Mavericks installation changing preferences I had set before the upgrade: After installing Mavericks I recommend you check all settings in System Preferences to assure they are set to your liking. Installing Mavericks changed some System Preferences I customized under Mountain Lion. Mail 'Assertion failure' messages in Console.Changed settings in System Preferences.The upgrade was performed on the author’s Mac Pro (Mid-2010) equipped with a 2.8 GHz Quad-Core Intel Xeon processor, 6 GB of1066 MHz DDR3 RAM, and two internal 1 TB hard disk drives. This FAQ describes some post-installation issues experienced by the author after upgrading from Apple® OS X® 10.8.5 Mountain Lion to OS X 10.9.2 Mavericks. OS X 10.9 Mavericks Post-Installation Issues

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