No exactly. It's more that 1) Cyrus doesn't integrate closely with unix/linux user accounts which may or may not be a good thing. If you are an ISP providing email only you may want that. If you are an office providing file/ftp/print, etc. services for all the same users you may double your setup work per user.
Have you read anything from one of my previous mails? Cyrus integrates with unix/linux user accounts just fine. Should you choose to use it that way. The default Fedora RPM config is to use unix/linux accounts (/etc/shadow file, to be more precise) for authentication.
Forward and procmailrc files are Sendmail thing anyhow (or any other MTA). IMAP server (Cyrus, Dovecot, whatever) do not have anything to do with it (they are all processed long before mail is passed towards mailbox (be it in "standard" Berkely format, maildir, Cyrus, or something else).
If you use cyrusv2 as local mailer in Sendmail, and you want to continue using forward files, simply tell Sendmail that there are local user accounts. Default for cyrusv2 mailer is no local accounts (therefore, Sendmail will not search home directories for forward files), but that is only the default flag that is trivial to change. I believe this is described in FAQ. Again, this is Sendmail issue (or issue of your MTA of choice, if you are not using Sendmail), not Cyrus issue. The default in Sendmail for cyrusv2 mailer is set that way since majority of Cyrus installations do not have local users accounts.
If you want to continue using procmailrc files, simply keep procmail as your local mailer. The only difference is that you'll have to use deliver program from within procmailrc (as of this writing procmail can't write directly into the Cyrus mail store). Since default for procmail mailer is that local user accounts exist, forward files will be honored by Sendmail by default in this case. Yet again, this is Sendmail issue.
2) Cyrus is unlike anything else, so if you replace an existing system you will have to re-learn administration and you'll probably break things that users have taken for granted for years.
The only granted thing you'll take from them is that they can't write directly into the mail store whatever way they please anymore. IMO, this is a good thing, once implemented. At least they won't be able to nuke their mailboxes in the most un-imaginable ways.
-- Aleksandar Milivojevic <amilivojevic@xxxxxx> Pollard Banknote Limited Systems Administrator 1499 Buffalo Place Tel: (204) 474-2323 ext 276 Winnipeg, MB R3T 1L7
