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Hi, I want to do On-premise Exchange 2016 to 2019 Migration and Co-existence. I got this error when trying to migrate user from 2016 to 2019
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(246.4, 22%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EKY%3C/text%3E%3C/svg%3E)
Hi @Takeru Yama
Please have a check if the source database or the target database is in dismounted status.
If yes, please mount the database first and retry the migration.
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