We use for pair of weeks KMS 6.4 and now 6.5 after MS Exchange. During this period we got into few bugs and "features".
1. In some cases IMAP folders with national (russian) characters can not be subscribed, deleted or scanned for messages using IMAP client. Problems with some other IMAP operations. Tried Outlook, Outlook Express, MS Live Mail, Opera and some others. From Web Client all is OK with such folders. Example of such folder is "АБВГД 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789 0123456789". Effect is better when folder is subfolder of some other folder. In 6.4 version we had the same problem but in much large scale. Rather bad. Our sales and support departments have a lot of folders with russian characters and long names.
2. In Web Client in some situations we can not use "View Source". Instead we see empty window and message in "error Log" like "httpserver.cpp: PHP Warning: htmlspecialchars() [<a href='function.htmlspecialchars'>function.htmlspecialchars</a >]: Invalid multibyte sequence in argument in /opt/kerio/mailserver/webmail/default/mailSource.php on line 24". This situation often take place for letters blocked and forwarded from Antispam, antivirus and "attachment checking" modules to admin account.
3. Strange sorting of folders in case of russion characters in folders names. Imaging our tech support mail box have a lot of folders according to cases and customers. It is rather difficalt to serch needed folder in current situation.
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