Build 16.0.8528.2147 (Version 1709) of the 32-bit version of Outlook 2016 for Windows has been updated to be Large Address Aware (LAA). This increases the maximum address space available to Outlook from 2 GB to 4 GB when it is running on a 64-bit version of Windows. This is key to improved graphics rendering in Outlook when using newer displays that support higher screen resolutions.
How does this affect me?
While LAA Outlook has been extensively tested, there is the possibility that some third-party or in-house developed Outlook COM Add-ins may experience issues with the change. Only 32-bit, 1709 versions of Outlook 2016 or later and running on a 64-bit version of Windows may be impacted.
The symptoms may range from COM Add-ins that crash or that exhibit unexpected behavior or errors. Outlook’s current design automatically disables any COM add-ins that crash. Office store add-ins are not impacted by the LAA change.
What do I need to do to prepare for this change?
If the COM Add-in is developed by a third-party vendor, please contact that vendor to report the issue and to ask if their COM Add-in has been or is being updated. For any COM Add-ins developed in-house, report the issue to your internal developer.
If the COM add-in is business critical to your organization, you may revert the Office 2016 Click-to-Run installation to an earlier build. LAA functionality is built into Outlook 2016. Therefore, it is not a separate feature that can be disabled by Group Policy, a registry value or via the user interface.
To revert to an earlier version of Office 2016, you must disable automatic updates in Office, install a previous build, and then after the add-in has been updated to work with LAA, re-enable automatic updates in Office. For more information on reverting to an earlier version of Office 2016, please see How to revert to an earlier version of Office 2013 or Office 2016 Click-to-Run.
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Tags: Microsoft, Microsoft Office, Outlook