Lets take a look at an issue in E2013 where Pop/Imap clients unable to Authenticate Environment: Exchange 2010 SP3: 2 mailbox server in DAG, 2 CAS/HT with windows NLB Exchange 2013 CU1: 2 mailbox server in DAG, 2 CAS with windows NLB Issue: During the co-existence phase during Exchange 2010 to 2013 migration, Pop/Imap clients are … Continue reading Exchange 2013: Pop/Imap clients unable to Authenticate