Microsoft announced recently that it and AT&T are delivering the Windows Phone 7.5 Mango update to Samsung Focus smartphones that shipped with firmware version 1.4. The update should appear on user devices soon. Microsoft is also sending out the first wave of post-Mango maintenance updates to a number of phones and carriers around the world. Microsoft reminds users to make sure they have the latest Zune syncing software and check for updates periodically. The maintenance updates generally provide performance tweaks and bug fixes.