This article originally appeared in TidBITS on 2015-05-20 at 11:59 a.m.
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Microsoft Office 2011 14.5.1

by Agen G. N. Schmitz

Microsoft has issued version 14.5.1 of its Office 2011 [1] suite, which fixes a major bug with Outlook that was introduced by the recently released version 14.5 update. Version 14.5.1 patches the same security vulnerability [2] included in version 14.5, which could allow remote code execution from maliciously crafted Word, Excel, and PowerPoint files due to how Office 2011 handled files in memory. However, that previous release rendered Outlook’s main window invisible [3] in OS X 10.10 Yosemite (earlier systems didn’t seem to be affected), and required either a restoration of version 14.4.9 from a backup or a deletion of preferences via Terminal (as noted by this Apple Support discussion thread [4]). It may be worth holding off on installing this latest update for a few days to make sure that the fix is truly in for Outlook’s invisibility cloak. (Free update from the Microsoft Download Center [5] or through Microsoft AutoUpdate, 114 MB, release notes [6], 10.5.8+)