This is because an upgrade process will still leave several (support) components installed.
If you only want to install Outlook 2016 and combine it with Office applications of previous versions of Office see the Outlook 2016 compatibility with previous versions of Office section later in this guide.
When it comes to Outlook, there is no direct benefit of having the 64-bit edition instead of the 32-bit edition.
For more information see: Should I install the 32-bit or 64-bit version of Office/Outlook?
After updating, you may receive duplicates from the mail server one last time.
To get rid of these duplicates see: Delete duplicates after emails got redownloaded Disable Updates Additionally, create a reminder in your Calendar to re-enable updates in April as a fix for this issue should be deployed by then.
If your contacts, calendars, and reminders are in i Cloud, then i Cloud automatically updates your information.
If you want to install the 64-bit edition, keep reading…In order to install the 64-bit edition of Office 2016, you’ll first need to uninstall all 32-bit Office applications, including older versions.
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Note: When uninstalling Office, you will not lose any settings or Outlook data and settings will still be automatically upgraded.
It of course never hurts to make a backup of your Outlook data first.