In an Exchange 2013 or Office 365 project utilizing SQL Express, the Migration Agent for Exchange (MAgE) may stop functioning, and the following or similar errors may be seen in the MAgE.log file:
2018-08-08 18:13:02.9906 PxA8C Tx7B A11 C5 M2836 Error System.Data.SqlClient.SqlException: Could not allocate space for object 'dbo.ITEM_MATCH'.'PK_ITEM_MATCH' in database 'Exchange365' because the 'PRIMARY' filegroup is full. Create disk space by deleting unneeded files, dropping objects in the filegroup, adding additional files to the filegroup, or setting autogrowth on for existing files in the filegroup.
at Quest.MigrationManager.Exchange.MigrationConnectors.ConnectorStorageSQL.SetMatch(String itemId, String matchId)
at Quest.MigrationManager.Exchange.MigrationConnectors.EwsBatchUploader.MessageCopied(String sourceId, String targetId, String targetChangeKey)
at Quest.MigrationManager.Exchange.MigrationConnectors.EwsBatchUploader.MessageCopied(String sourceId, String targetId, String targetChangeKey, Int32 messageSize)