Migrate O365 mailboxes using Hard Matching with ImmutableID

By Tom Kitching

I have been working on a mail migration within an environment that has a Hybrid Exchange configuration with a single 365 tenant but which synchronises Active Directory from multiple forests. As part of the migration there is a need to migrate on-prem user accounts from a legacy forest into a new forest, but the accounts…

Adding Users to O365 Distribution List

By admin

A script I recently used to add members to an office 365 distribution group using a remote exchange session in a hybrid setup (covered at the end). 

CSV file contains UPNs of all users to be added. I also found it useful to see who had permissions to send to this group using

Add New Users using Exchange Admin Center (Exchange 2016)

By admin

This only applies to new Active Directory users.  To look at how to use SMTP matching to link an on-prem user to an existing O365 mailbox in a hybrid environment follow this guide.1. Log into the Exchange Admin Center: https://mail.contoso.com/ecp2. In the EAC console of your on-premises hybrid server, go to Recipients > Mailboxes and click…