courier-imap to cyrus-imap migration

[gen2]

I'm trying to transfer a small number of accounts from courier-imap to a new 
cyrus-imap server, and was hoping to be able to just drag the mail from a 
courier-folder to a cyrus-folder for easy migration.

It's possible to move mail this way (on my current config) from cyrus to 
courier, but not the other way around. When trying, an error comes up (in 
Kmail) saying "Could not write to file: <(my cyrus server)>"

Thanks for any suggestions!
WR
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