The tree structure is maintained by the file HIERARCH.PM in you mailbox directory, deleting it (while Pegasus Mail is closed) should bring back all your folders, but it will also remove all trays, so you might want to keep a backup and carefully edit it (using a plain text editor (such as formerly called NotePad), no office application!) by removing outdated lines (such as the ones containing Name_Unavailable) and testing the results.

I am using Pegasus 4.41 under Windows XP SP 3 and had until yesterday about 190 PMM files visible in my folder tree.

But now I can see only 80 of them, although still 190 are in the MAIL directory.

Question: How can I rebuild the folder tree structure in Pegasus so that I have again access to all mails in all folders.

An update to 4.51 showed no positive effect.

Best Regards

Uwe Wesemann

[quote user="Uwe Wesemann"]

I am using Pegasus 4.41 under Windows XP SP 3 and had until yesterday about 190 PMM files visible in my folder tree.

But now I can see only 80 of them, although still 190 are in the MAIL directory.

Question: How can I rebuild the folder tree structure in Pegasus so that I have again access to all mails in all folders.

 An update to 4.51 showed no positive effect. 

Best Regards

Uwe Wesemann

[/quote]

In the Mail directory, either delete or rename the HIERARCH.PM and CACHE.PM files.  Then start Pegasus up. You should see all the folders for which there are actual .PMM/.PMI files in the Mail directory. These files will be rebuilt when Pegasus is next closed.