migrating from maildir (courier) to cyrus

[Vadim]

I am looking for some documentation on how to transfer mail from maildir 
format (courier) to cyrus. I tried to look for it in 
documentations/archives but I only found mbox->cyrus and cyrus->maildir.

I am currently running exim4/procmail/courier setup on Debian box.  It 
serves as a mail server for a few users with large amount of mail.  Some 
of the folders have nearly 10,000 messages.  Courier works very good on 
small folders but have problem on larger one (and it is old computer 
with only 32Mb RAM).  My understanding is that cyrus would perform much 
better due to indexing/database used by cyrus, am I correct?

Thanks,
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