Upgrade from cyrus-imapd2.1.x to cyrus-imapd2.2.3

[Wang Penghui]

Hello, everyone!

My mail server which built with Cyrus-imapd2.1.15 postfix2.0.19 OpenLDAP 
2.1.26 has to upgrade form cyrus-imapd2.1.15 to 2.2.x. What's the 
important things i have to pay more attention to when i do that. And 
what's the ditails of howto? Could someone who has experience of it pick 
me up a way to do it?

There are some questions about it:
1. Do the other softwares need to upgrade, such as cyrus-sasl?
2. How to backup and restore all the messages and users info store at 
the mailsystem?
3. Is there any other things i have to do?


My system is under gentoo box.

Thank you very much.

Wang Penghui
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