This is how to resolve conflicts between mail users or contacts and Guest accounts in Azure AD. If you create mail users or contacts in
How to convert existing primary email addresses to lowercase, as well as ensuring that any new mailboxes also have lowercase primary email address. You may
How to create users and shared mailboxes in a Hybrid Exchange environment. If you are running a hybrid environment, with Active Directory and Exchange on-premises
This is a simplified guide with everything that you need to do in order to get hybrid permissions working when migrating to Exchange Online. In
In on-premises versions of Exchange, you could update address lists manually, as well as modifying the schedule through which they were updated. Exchange Online only
How to enable the External Recipient mailtip in Exchange Online. The External Recipient mailtip is not enabled by default, but is useful for warning users
Fix for Outlook 2016, 2019, 365 prompting for a password when adding a second mailbox in Exchange Online, when the primary mailbox is still on-premises.
If you used a custom install of Azure AD Connect and created your own service account for the connection to your on-premises AD, you will
An in-depth yet accessible guide on how to configure retention policies, archive policies, and enable archive mailboxes in Office 365. Whilst we are at it
You may find that when you run the Exchange Hybrid Configuration Wizard that it does not run. If you launch it from Exchange Admin Center,
