Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Office 2019 is cloud-based, and requires you to log all your Office products into an outlook.com e-mail account, even if you do not otherwise need one, and even if you purchased the software up front and not on a subscription.
If you do not have an outlook.com e-mail account you will need to create one in order for your Office apps to work and in order to use Outlook, even if you don't use the required outlook.com e-mail address in your Outlook profile.
Office assumes that, if you have any outlook.com e-mail inbox in your Outlook profile (I have three, all for clients), then the organization that owns any outlook.com e-mail domain in your Outlook profile owns your machine and has unrestricted access to your content.
Thus, if you have any outlook.com e-mail inboxes in your Outlook profile, say for school or for clients, Office will log your Office apps into one of these randomly in order to use non-Outlook Office apps, even if your default e-mail inbox in Outlook is POP/SMTP, and none of the outlook.com addresses are in domains that you own. When Outlook automatically logs your Office products such as Word, Excel, PowerPoint, etc, into one of your clients' outlook.com accounts it cross-shadows your work for one client through the cloud for another client.
If you change the outlook.com account into which your Office apps are logged in to, your apps will lose all your settings, and lose track of your recent files. If you disconnect all your Office apps from any outlook.com e-mail address, then Outlook will not even open.
Independently of the mandatory cloud, Office 2019 apps no longer remember from which local folder you opened a file to work on it when you go to save it using save as. Instead of listing the folder the file came from in save as, it lists the last folder from which you opened any file using any Office app. You have to be careful not to save iteratively named files across a random array of unrelated folders and losing track of them, as the source folder is no longer selected for you.
Yes. This is crazy, but MS Level 3 support duplicated this, insisted it is normal, and told me the only way for my paid-up non-subscription Office Pro 2019 software will work is if I create an outlook.com e-mail address that I will never use except for my Office apps to log into it for their required cloud connection.
I am not making this up.