As far I know CSSand CUE 2.3 supports IMAP ports. Refer URL for more information http://www.cisco.com/en/US/docs/voice_ip_comm/unity_exp/rel2_3/cliadmin/ch_imap.html#wp1065580
yes you can do this.
All these protocols use TCP.
IMAP uses port 143
SMTP uses port 25
....
So, you can either do 1 content rule to loadbalance all traffic (UDP/TCP) and you do not care about what it is.
Or you can have 1 content rule for only TCP traffic.
Finally, you could 1 content rule for each protocol you mentioned.
I don't think there is anything special to do.
example #1:
owner MyCompany
content MyServers
vip address x.x.x.x
add service s1
add service ...
active
!!! this is if you do a layer 3 rule. So, all traffic is loadbalanced
example #2:
owner MyCompany
content IMAP
vip address x.x.x.x
protocol tcp
port 143
add service ....
active
