Well, actually I fixed it by attaching to docking station again and then was able to get to the former neitherspace of the extended desktop again and use the popup window. :)

 Thanks for the windows position information location.

 There are a number of issue's I've had with extended desktops...usually the problems is that programs will pop things up in the 'main' monitor no matter if the application is running in the extended desktop.  Only this window instance...and one of a particular Winamp plugin...have caused me issues by insisting upon popping up in a non-existent extended desktop.  And this one is the only one that wouldn't let me access it via the normal windows capabilities of cascade/tile/...or 'move'.

After using the same pegasus mail setup for many years - on at least 10 different computers I suddently cannot create a new mail folder. 

I click on the 'create folder' icon and....nothing visibly happens except winpmail32 will simply freeze.

 Is this a situation that will be fixed by deleteing/rebuilding the heirarch.pm file?

[quote user="qevan"]

After using the same pegasus mail setup for many years - on at least 10 different computers I suddently cannot create a new mail folder. 

I click on the 'create folder' icon and....nothing visibly happens except winpmail32 will simply freeze.

 Is this a situation that will be fixed by deleteing/rebuilding the heirarch.pm file?

 [/quote]

I suspect that there is a window opening but it's behind other windows or even off screen.  Try using the Window | Tile or Cascade to bring the windows into view. 

Ok, that was the issue.

Apparently the last time I'd created a new folder it was when I had the laptop connected to my docking station - with a 2nd monitor available (extended desktop). 
Also, apparently I had moved the 'Enter name for folder or tray' popup window to the extended desktop monitor as well.

So, when I had the laptop running without the extended desktop and then clicked to add a folder the 'Enter name for folder or tray' window popped up in the neitherspace of no extended desktop.  

And when this is happening the Pegasus Mail's focus is forced to the 'Enter name for folder or tray' popup window and it is impossible to get to the 'Window' menu of the Pegasus Mail main application window.   Nor is there a task-manager entry for that popup window that I can access it with a 'Move' or some-such to bring it back from the neithersphere.  Nor will Windows' own 'cascade' or 'tile' options bring that window back from the extended desktop.  Only the main Pegasus Mail window is affected.

 To reiterate - the 'Enter name for folder or tray' popup window will always pop up in the last place it was dragged to, even if onto an extended desktop that is not currently existing. 

When that popup window is active it is impossible to access the main pegasus mail window to tile or cascade. I don't think that would help anyway as that is a window 'external' to the main Pegasus Mail window.

Finally, Windows XP's' own 'Tile Horizontally' or 'Tile Vertically' or 'Cascade  Windows' functions will *not* tile or cascade that 'Enter name for folder or tray' window with other ones - only the main Pegasus Mail window. 

Then you need to go to the pmail.ini or state.pmj to fix the windowing problem.  Not sure exactly which one it is but in going through the files you'll see a number of window position entries.