Pegasus looks to a file named PMAIL.USR for user information.  This file is located in the root \MAIL directory.  In a default installation this would be C:\PMAIL\MAIL.  One possibility for your problem is that something has happened to this file or Pegasus Mail can't find it.  This could happen if you have the mailboxes located in a remote location and the PC has lost that connection.

See if you can view the contents of the PMAIL.USR file with a text editor.  Each user should be listed in the following format:

      U;username;Personal Name OR A;username;Personal Name

The "U" indicates a normal user, the "A" indicates an administrator.

If you can then look at the directory structure of you \MAIL directory.   The subdirectory names should be the same as the usernames of the users.  These the user mailbox directories.  One should exist for each entry in the PMAIL.USR file.

If all looks good than the PMAILCFG file may have gotten corrupted.  This file tells Pegasus Mail where the mailbox directories reside.  It is located in the directory where the Pegasus Mail executable files are located (default is C:\PMAIL\PROGRAMS).  This file is not editable with a text editor so I suggest a restore from a backup.  If a backup is not available then a reset using the PCONFIG.EXE utility is the next option.  PCONFIG.EXE is a 32 bit DOS app.  Usage is dependent on a 32 bit OS or a DOS emulation app like DOSBOX.  If you need to use PCONFIG it would be worthwhile to do a search in this forum on "PCONFIG".

Pegasus 4.63  OS WIndows XP SP 3

This morning, both User names resulted in an error message "The person you are trying to become does not exist" or something very similar.

Nothing has changed overnight, when both Users names were accepted.

I assume a small file has been changed - please can anyone provide enlightenment and a fix (hopefully).

All help will be highly appreciated [:D]