The mailbox you are trying to convert to shared mailbox belongs to an user that has an administrator role assigned. In order to proceed with conversion, you have to first remove Administrator role from the user because they will not be able to log into the admin portal after conversion.
The mailbox database '{1}' on server '{0}' hasn't been backed up in last {2} hours, LastFullBackup time:{3}, LastIncrementalBackup ...
The mailbox database '{1}' on server '{0}' isn't configured to mount on startup of the Exchange Information Store service. ...
The mailbox database '{1}' on server '{0}' wasn't backed up in the last {2} hours, LastFullBackup time:{3}, LastIncrementalBackup ...
The mailbox migration is in progress. Migrations can take several hours depending on mailbox size and internet connection ...
The mailbox you are trying to convert to shared mailbox belongs to an user that has an administrator role assigned. In order ...
The mailboxes that have been disabled, but which still remain on the servers for a period of time as defined by the mailbox ...
The MaxFieldLength HTTP parameter on server '{0}' hasn't been set to 32768. In large environments, the absence of this value ...
The maximum '{0}' message size is set too low for your Exchange organization '{1}'. Current maximum message size is {2} KB. ...
The maximum '{0}' message size isn't set correctly for your Exchange organization '{1}'. Improperly configuring your message ...