I'm attempting to move messages from Exchange 5.5 to Zimbra via imapsync.

When I try, I get the following message:

exchsvr: No CAPABILITY for AUTHENTICATE CRAM-MD5

Clear Text login is enabled on Zimbra.

I've installed the following Perl modules:

Mail::IMAPClient
Term::ReadKey
Net::SSLeay
Getopt::Long
MIME::Base64
Digest::MD5
IO::Socket::SSL

Anyone have any insight on how to fix this problem?