That name already exists, please rename.

[Steven Vollom]

I was erasing many email that were useful as referrals from the list.  
When someone had helped in the past and I forgot the instruction, they 
would refer to the other email, but it usually had been erased.

Since then, I have saved every email from the list.  On occasion I will 
receive help from someone who has not written in a while.  A folder 
exists with their name on it, but when I click on move to, the list that 
comes up does not always include there name, while it still shows on the 
left of my screen in Thunderbird.  Many times I have just made another 
folder, so I don't lose the data, but recently I get a window that says 
that folder already exists and no longer allows me to create a duplicate 
folder.  However, by creating the duplicate folder I was able to get the 
name back on the 'move to' list.  Do you have any ideas how I can 
correct the problem.  When I am forgetful, I don't want to duplicate 
anyone's help efforts anymore.  Thanks!

Steven