
At this time, ITS also supports connecting with other compatible mail clients using the Exchange and IMAP4 with OAuth2 connection methods, although Exchange is highly preferred. If you are using Microsoft Outlook as your email client, you should use the default Microsoft 365 Account type. Microsoft 365 also provides direct access to the USC calendar that is a part of your Office 365 account. Microsoft 365 only requires that you provide your email address and password for set up IMAP, however, requires additional server information. There are several advantages to setting up your email client to use “Microsoft 365”, “Office 365”, or “Exchange” rather than IMAP settings. If you are using an email client other than Outlook and Microsoft 365 or Office 365 is not a setup option, we recommend selecting the Exchange setup option and only using the IMAP (Internet Message Access Protocol) option if there is no other choice. When configuring your email client to work with your USC mailbox, we recommend selecting the Microsoft 365 setup wizard (choose when setting up Outlook). This page provides links to documentation on how to configure your email client to access Office 365. I don't want o365 and want to keep all Office products not signed in to any account.ITS highly recommends using the Outlook email client or Outlook Web App (OWA) to access your USC Office 365 email. Enabling ADAL allows o365 to authenticate and connect to Outlook, but then it goes back to the original issue of logging in to all microsoft apps on all accounts. However, I can no longer login to my o365 account on Outlook. I can login normally on Outlook, open Word and won't be logged in. This works for both of my Outlook accounts. HKCU\SOFTWARE\Microsoft\Office\16.0\Common\Identity\EnableADAL=0

I did some researching and came across a SuperUser thread where someone had the similar issue and added the following registry key: I would prefer to not be logged into any account on Office applications unless I specifically choose to. Managed to login fine with both of my Outlook accounts as well as my university's o365 account, however when I opened any other Office 2019 application (Word, Powerpoint etc.) I was logged in to all 3 accounts. Recently reinstalled Windows 10 and have been setting up my email accounts on Outlook 2019.
