Yes that's what was done
Remove
dovecot-1.2.17-0_116.el5
dovecot-managesieve-0.11.13-0_6.el5
dovecot-sieve-0.1.19-9.1.el5
then installed Dovecot
[dovecot-upgrade]# rpm -ivh dovecot-2.0.21-0_136.el5.x86_64.rpm
warning: dovecot-2.0.21-0_136.el5.x86_64.rpm: Header V4 DSA signature: NOKEY, key ID 66534c2b
Preparing... ########################################### [100%]
1:dovecot ########################################### [100%]
[root@mail dovecot-upgrade]# rpm -ivh dovecot-managesieve-0.4.1-28.el5.x86_64.rpm dovecot-pigeonhole-0.4.1-28.el5.x86_64.rpm
warning: dovecot-managesieve-0.4.1-28.el5.x86_64.rpm: Header V4 DSA signature: NOKEY, key ID 66534c2b
error: Failed dependencies:
dovecot >= 1:2.2 is needed by dovecot-pigeonhole-0.4.1-28.el5.x86_64
[root@mail dovecot-upgrade]# rpm -ivh dovecot-pigeonhole-0.4.1-28.el5.x86_64.rpm
warning: dovecot-pigeonhole-0.4.1-28.el5.x86_64.rpm: Header V4 DSA signature: NOKEY, key ID 66534c2b
error: Failed dependencies:
dovecot >= 1:2.2 is needed by dovecot-pigeonhole-0.4.1-28.el5.x86_64
But dovecot is already installed