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Exchange Setup can't continue because it can't remove a user mailbox database from the local server without incurring potential data loss.
Before Exchange Setup removes the Mailbox server role from a server, it checks for one of the following conditions:
- All mailbox databases are removed from the server.
- Databases on the server don't contain active mailboxes. However, user mailboxes might still remain on the server.
To resolve this issue, do either of these steps:
To preserve the mailboxes and their content, move the mailboxes to another server. For instructions, see Mailbox moves in Exchange Server.
Disable the mailboxes if they're no longer required. For more information, see Disable-Mailbox.
Remove the mailbox databases if they're no longer required. For instructions, see Manage mailbox databases in Exchange Server.
After you deal with the mailbox databases on the server, run Exchange Setup again.
- For more information about how to identify a mailbox in the database, see Get-Mailbox.
Having problems? Ask for help in the Exchange Server forum at Exchange | Exchange Server | Management.