I use dovecot as my imap server, and everything is ok.
 
I used an IMAP client from Windows XP (Outlook Express) as well as Pocket PC (Windows Mobile 5) and webmail.
 
The problem is that I recently used Windows Vista and its imap client (Windows Mail), and problems began.
 
From the Windows XP machine, all is ok, but from the Pocket PC a weird thing happens:
 
When I first configure the client, in the Received Items, it shows all items correctly, but then, when starting to donwload, they simply disappear. All other folders are OK. Problem is just  in inbox.
 
I thing (although my tests were not exaustive) that deleting the .imap folder solves the problem, but I just can't understand why, because it is recreated again...
 
Any help?
 
Thank you,
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