Overview of services running on Port 143 TCP.
~6.18 Million IP addresses observed from May to December 2012
To get raw lists of the data go to Download. For an explanation of what this data is and how it was obtained, see Paper.

Servicename	Product	Count	Percent
imap	Dovecot imapd	2947510	47.689
imap	Courier Imapd	1747609	28.275
no match	-/-	275870	4.463
imap	UW imapd	267306	4.325
imap	IdeaImapServer imapd	146315	2.367
imap	Microsoft Exchange 2007-2010 imapd	98487	1.593
imap	MailEnable imapd	85111	1.377
imap	Microsoft Exchange Server 2003 imapd	80777	1.307
imap-proxy	nginx imap proxy	71785	1.161
imap	Cyrus imapd	66302	1.073
imap	Alt-N MDaemon imapd	51711	0.837
imap	SmarterMail imapd	46523	0.753
imap	hMailServer imapd	39030	0.631
imap	Zimbra imapd	32052	0.519
imap	IMail imapd	27911	0.452
imap	Kerio Connect imapd	19565	0.317
imap		17806	0.288
imap	Microsoft Exchange 2000 imapd	13686	0.221
imap	Kerio imapd	13613	0.22
http		13343	0.216
imap	Lotus Domino imapd	11213	0.181
imap	Perdition imapd	8905	0.144
imap	Microsoft Exchange 2003 imapd	8881	0.144
imap	Microsoft Exchange 2007 imapd	7162	0.116
imap-proxy	Mailfront imapfront imap proxy	7079	0.115
mongodb	MongoDB	5354	0.087
imap	Microsoft Exchange imapd	5091	0.082
imap	Merak Mail Server imapd	4706	0.076
http	SonicWALL	4172	0.068
imap	Novell GroupWise imapd	3991	0.065
imap-proxy	Zarafa imap proxy	3696	0.06
imap	Tobit David.fx imapd	3331	0.054
imap	Binc imapd	3252	0.053
imap	Citadel imapd	3166	0.051
imap	Mercury/32 imapd	2780	0.045
chat	AIM or ICQ server	2568	0.042
imap	DBMail imapd	2040	0.033
ssl	SSLv3	1593	0.026
http	Apache	1580	0.026
imap	Nortel CallPilot imapd	1504	0.024
imap	Scalix imapd	1448	0.023
imap	FirstClass imapd	1347	0.022
imap	SCO imapd	1295	0.021
http	a_63	1289	0.021
imap	Eudora Internet Mail Server X imapd	1137	0.018
imap	SurgeMail imapd	990	0.016
http	lighttpd	964	0.016
http	AIM	734	0.012
http-proxy	CCProxy http proxy	712	0.012
imap	Axigen imapd	708	0.011
imap	AVM KEN! imapd	697	0.011
imap	IMAPMax	689	0.011
imap	MailSite imapd	664	0.011
imap	ArGoSoft imapd	608	0.01
ssh	OpenSSH	574	0.009
imap	Dovecot DirectAdmin imapd	552	0.009
imap	Atmail imapd	536	0.009
imap	ArGoSoft Pro imapd	533	0.009
imap	Arvixe imapd	463	0.007
http	Microsoft IIS httpd	461	0.007
imap	Cyrus Murder imapd	444	0.007
imap	JanaServer imapd	372	0.006
imap	Mailtraq imapd	359	0.006
imap	VisNetic MailServer imapd	328	0.005
http-proxy	Squid http proxy	315	0.005
imap	Sun Java System Messaging Server imapd	314	0.005
imap	Cisco imapd	302	0.005
http	thttpd	299	0.005
smtp	Microsoft Exchange smtpd	290	0.005
http	Netwave IP camera http config	232	0.004
http	DrcomServer1.0	228	0.004
imap	Sun Java System Messaging Multiplexor imapd	222	0.004
imap	Mirapoint imapd	220	0.004
tcpwrapped	BSD TCP Wrappers	217	0.004
imap	CommuniGate Pro imapd	214	0.003
imap	Dovecot MUA imapd	186	0.003
imap	Novell NetMail imapd	174	0.003
http	Apache Tomcat/Coyote JSP engine	165	0.003
http	Avtech AVN801 network camera	160	0.003
imap	Floosietek FTgate imapd	147	0.002
http	Boa HTTPd	141	0.002
vnc	VNC	138	0.002
http	GoAhead-Webs httpd	133	0.002
imap	MailEnable Professional imapd	128	0.002
http	Microsoft HTTPAPI httpd	121	0.002
smtp		117	0.002
imap	ModusMail imapd	115	0.002
http	mini_httpd	114	0.002
ssh		111	0.002
imap	PMDF imapd	108	0.002
imap	Atrium Software's Mercur imapd	98	0.002
imap	GNU Mailutils imapd	88	0.001
imap	Sun iPlanet Messaging Server imapd	84	0.001
http	PDR-M800	84	0.001
telnet		80	0.001
imap	Google Gmail imapd	77	0.001
http	uc-httpd	71	0.001
imap	Slackware 3.5 imapd	65	0.001
imap	Softalk imapd	63	0.001
http	Hikvision-Webs	61	0.001
arcserve	ARCserve Discovery	60	0.001
ssh	Dropbear sshd	59	0.001
imap	DvISE imapd	59	0.001
imap	Classic Hamster imapd	55	0.001
pop3	MailEnable POP3 Server	53	0.001
openvpn	OpenVPN	52	0.001
telnet	Pocket CMD telnetd	49	0.001
mysql	MySQL	43	0.001
smtp	Postfix smtpd	42	0.001
imap	AppleMailServer imapd	42	0.001
http	nginx	41	0.001
http	Gadspot/Avtech AV787 webcam http config	41	0.001
imap	DavMail imapd	39	0.001
http	Mbedthis-Appweb	39	0.001
ftp	Microsoft ftpd	36	0.001
ftp	FileZilla ftpd	36	0.001
http	uTorrent WebUI	35	0.001
smtp	Microsoft ESMTP	34	0.001
http	GoAhead-Webs	31	0.001
http	Cross Web Server	31	0.001
http	DD-WRT milli_httpd	30	0.0
imap	Netscape imapd	28	0.0
http	GeoVision GeoHttpServer for webcams	28	0.0
http	DVR Systems webcam http interface	28	0.0
ssl	Microsoft IIS SSL	26	0.0
pop3	Dovecot pop3d	25	0.0
imap	DBOX DKIMAP4 imapd	24	0.0
ftp		24	0.0
imap-proxy	imapproxy	23	0.0
imap	Netscape Messaging Server Imapd	23	0.0
imap	eXtremail IMAP server	23	0.0
ftp	vsftpd	23	0.0
ftp	Serv-U ftpd	23	0.0
vnc	RealVNC Enterprise	22	0.0
http-proxy	MikroTik http proxy	21	0.0
http	AIM HTTP	21	0.0
ftp	ProFTPD	20	0.0
smtp	Microsoft Exchange 2010 smtpd	19	0.0
http	FlashCom	19	0.0
http	Datum	19	0.0
vnc	RealVNC Personal	18	0.0
vnc	Apple remote desktop vnc	18	0.0
http	GoAhead-Webs embedded httpd	18	0.0
ssl	TLSv1	17	0.0
smtp	Alt-N MDaemon mail server	17	0.0
imap	Microsoft Exchange Server imapd	17	0.0
http	RemotelyAnywhere remote PC management httpd	16	0.0
http	QNAP TS-219P NAS http config	16	0.0
http-proxy	F5 BIG-IP load balancer http proxy	16	0.0
ftp	Pure-FTPd	16	0.0
ssl	TLS	15	0.0
http	LuCI Lua http config	15	0.0
http	libwww-perl-daemon httpd	15	0.0
directconnect	Direct Connect P2P	15	0.0
pop3	Microsoft Exchange 2007-2010 pop3d	14	0.0
http	Jetty	14	0.0
smtp	Sendmail	13	0.0
imap	DeskNow imapd	13	0.0
imap	Worldmail imapd	12	0.0
http	TeleEye	12	0.0
http	MS-SDK-HttpServer	12	0.0
soap	gSOAP soap	11	0.0
psql	Pervasive.SQL Server - Relational Engine	11	0.0
http-proxy	Tinyproxy	11	0.0
http	dcs-lig-httpd	11	0.0
http	Allegro RomPager	11	0.0
ssh	Bitvise WinSSHD	10	0.0
socks5		10	0.0
rtsp	Avtech MPEG4 DVR control rtspd	10	0.0
http	WebLogic httpd	10	0.0
http	TwistedWeb httpd	10	0.0