Office 365 enable IMAP/POP3 and SMTP access

First log in to Microsoft 365 admin portal at https://admin.microsoft.com/ as an administrator and go to Users screen:

Select an user and on the Mail tab click Manage email apps

Check IMAP, Pop and Authenticated SMTP to turn on the protocols

Have in mind it takes 20-30 minutes for the changes to take effect.

You should be able to login using your primary password, however we advise to use App passwords instead:

using (Imap imap = new Imap())
{
    imap.ConnectSSL("outlook.office365.com");
 
    imap.UseBestLogin(
        "AdeleV@limilabs.onmicrosoft.com",  
        "password");
 
    imap.SelectInbox();

    List<long> uids = imap.Search(Flag.Unseen);
 
    foreach (long uid in uids)
    {
        IMail email = new MailBuilder()
            .CreateFromEml(imap.GetMessageByUID(uid));
        string subject = email.Subject;
    }
 
    imap.Close();
}

Exchange administration

You can find the same settings through Exchange administration screens:

The post Office 365 enable IMAP/POP3 and SMTP access first appeared on Blog | Limilabs.