In a corporate environment, IT administrators look for these specific ISOs to ensure "clean" installs. Having a version updated to June 2016 means the software is more stable and secure out of the box compared to the original RTM (Release to Manufacturing) version from late 2015. System Requirements
The ISO contains both the x86 (32-bit) and x64 (64-bit) versions. While the 64-bit version is better for handling massive data sets in Excel, the 32-bit version was often recommended in 2016 for better compatibility with older add-ins. microsoft-office-2016-vl-proplus-32-64-bit-2016-iso-jun-2016
This is the most comprehensive suite available for Office 2016. It includes: Core Apps: Word, Excel, PowerPoint, and Outlook. In a corporate environment, IT administrators look for