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When using convert, the mail file conversion utility, you can use the -s option to prevent the utility from upgrading any folders when converting a mail file. However, when upgrading from R4.6 to R5, the option also prevents the Inbox folder from being upgraded. This results in the following error appearing when the database is opened:

Illegal circular USE: Object Variables

To work around this problem, edit the design of the mail file being converted. Enable the "Prohibit design refresh or replace to modify" check box in Design Properties, then re-run the conversion utility without the -s option.

Note: The upgrade by mail notification sent by an administrator to an end user does not use the -s option.