Windows

Try re-creating the mail profile. This may or may not help.

I have come across this error before and this should help:

Remove the database's icon from the Notes workspace. You may encounter one or two additional dialog boxes stating that the database cannot be read, however, you should be able to remove the icon once clearing the error boxes. Once the icon has been removed, add the icon to the workspace again. You should then be able to open the database.

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