A Rollup Update has been released for Outlook 2016.
This is a non-security update which contains 15 documented improvements and fixes.
You can check with the vendor of the add-in to verify its compatibility.
If you run into issues with Outlook after the upgrade, start with disabling your add-ins.
For more information see: Should I install the 32-bit or 64-bit version of Office/Outlook?
Note: Even when you are using the 32-bit edition of Office 2016, some add-ins might not be compatible yet with Office 2016.
When it comes to Outlook, there is no direct benefit of having the 64-bit edition instead of the 32-bit edition.Only a single version of Outlook can be installed at a time on a computer.When installing Office 2016 while a previous version of Outlook is still installed, Outlook 2016 will be installed and the previous version of Outlook will be removed; even when you select to keep the previous versions. This guide contains a lot of preparation and other information to get yourself ready to ensure a smooth transition Aside from the preparation steps, this guide informs you about what to expect when you start Outlook 2016 for the first time after you upgraded and how to troubleshoot several issues you may encounter during or after the installation.
Note: In order to use some of the functionality in Outlook 2016, you’ll need to configure your Exchange account with Cached Exchange Mode enabled (CEM). For an overview of features requiring CEM see: Outlook 2010: New features and Cached Exchange Mode Microsoft still recommends installing the 32-bit edition of Office 2016 instead of the 64-bit edition unless you have a specific need that requires the 64-bit edition of Office 2016.If you do not plan to use any of the Office applications of a previous version of Office, it is recommended to completely uninstall the Office suite before starting the installation process of Office 2016 unless you are using Office 365.