Now connecting to a shared/delegate account via O365 via IMAP  is not officially supported by Aid4Mail but we and other clients of ours have had success using the below syntax. 

As of October 1st, 2022, basic authentication (username and password) does not work when trying to connect to Microsoft accounts. Moving forward, you need to create an App Specific password for Aid4Mail when connecting to an account via IMAP>

Once you create an app password, use the app password in the “password” field in Aid4Mail.

Also please refer to the following articles for more assistance:

In Aid4Mail you can try using the following format for your username (after selecting “IMAP” as your “Mail Source” and selecting “Office 365” as the “Imap Settings”): 

Username@DomainName\SharedMailboxAlias 

It can also be that you need to add the domain for the SharedMailboxAlias like this: 

Username@DomainName\SharedMailboxAlias@DomainName 

You will enter the password of the main user or admin (not the shared\delegate account). 

Here is how it looks in Aid4Mail 5:

If you experience any issues, please don’t hesitate to contact us.

If you would like to buy an Aid4Mail license, please visit the Aid4Mail website.