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  Here's weird problem that happens to Exchange admins while they want to move some users to different DB. I'm testing a mailbox move from Exchange 2016 database to different database that hs different mailbox quota . I can create a new migration batch for the user and it completes in short order, but the mailbox is not moved. The number of Total, Synced, Failed, and Successful mailboxes for the batch is zero. I get a notification email saying the batch completed successfully, but no mailboxes were moved or synced. When I look at the details of the migration batch in EMS I see that the ValidationWarningCount is 1 and the ValidationWarnings show, "Error:The user already exists, but the migration batch that includes it couldn't be found. Before you try migrating the user within a batch again, please remove the existing user by running the Remove-MigrationUser cmdlet." Whoever wrote that error message deserves a raise. MUCH better than the "Error code 2" I...

How to give permission to user to send email to mail group on Exchange Admin Center Login to Exchange Admin Center web link https://mailserver/ecp  Go to recipients , then groups then select a group that you want to give a user permission to send email to. Go to delivery management , here Click Plus sign to add a user to give permission to send email to this group. The default option is  ‘Only senders inside my organization’ .and  there is other option to make a group to receive external emails as well, 

How to create mail contacts of external users on exchange server Open Exchange admin center web link https://mailserver/ecp/ , navigate to Recipients > Contacts . Click New Add Icon > Mail contact . Complete the following boxes on the New mail contact page: First name : Use this box to type the contact's first name. Initials(Optional) :   Use this box to type the contact's initials. Last name : Use this box to type the contact's last name. Display name(Required *) : Use this box to type a display name of the contact. This is the name that's listed in the contacts list in the EAC and in your organization’s address book. By default, this box is populated with the names you enter in the First name, Initials, and Last name boxes. If you didn't use those boxes, you must still type a name in this box because it’s required. The name can't exceed 64 characters. Name (Required *) : Use this box to type a name for the contact. This is the nam...