When using an account that is running on an Exchange server provided by Microsoft, you can encounter this error:

Known Microsoft Exchange server error "User is authenticated but not connected" has been encountered on IMAP connection. This issue is temporary and should be automatically resolved by the server. If not, please contact your mail provider.

This error means that the authentication process for your account was succesfull, but for some reason the mail server is not giving eM Client access to the account data, so it cannot synchronize your messages into the app.

This can have a few different causes - sometimes it's a temporary issue that will go away on its own, but lately we had this issue reported with brand new outlook.com accounts that do not have IMAP protocol allowed.

• Sign in to your Outlook account either via the webmail (https://outlook.live.com/)
• Go to Settings > Mail > Forwarding and IMAP > Login > enter your credentials again
• Enable Allow devices and applications to use POP and Allow devices and applications to use IMAP
• Save your settings and click the Refresh button.

If you already have IMAP allowed and the issue does not clear on its own, reach out to your admin or provider of the email account so they can fix the issue.

If this is happening with an email account that is set up using an Alias and not the Primary email address, try setting up the account anew using the primary email address to see if that resolves the problem.