Christian Vallant wrote:
> 1.) Is it possible to use an alias of a shared folder

Probably, by creating an user alias and setting the ACLs to make its
mailboxes shared.

> 2.) Is it possible to define a sieve script to a shared folder

With the Cyrus server 2.2.x, it's possible to set SIEVE scripts on
shared mailboxes but apparently only with the admin user via cyradm
thanks to the ANNOTATEMORE (aka METADATA) extension.

With cyradm, manage the /vendor/cmu/cyrus-imapd/sieve annotation using
setinfo - cf.
http://www1.ietf.org/mail-archive/we.../msg01907.html &
http://www.die.net/doc/linux/man/man1/cyradm.1.html .

--
kael