Business Email Hosting Usage Distribution in the Top 1 Million Sites

Statistics for websites using Business Email Hosting providers

Technology	Websites	%
Google Apps for Business	159,971	16
Microsoft Exchange Online	133,520	13.35
Office 365 Mail	122,429	12.24
Mimecast	15,629	1.56
Zoho Mail	9,905	0.99
Rackspace Email Hosting	5,638	0.56
Symantec.cloud	3,617	0.36
Elastic Email	3,615	0.36
Dyn	2,071	0.21
Zimbra	2,020	0.2
Exclaimer	1,767	0.18
Namecheap Private Email	1,544	0.15
SpamExperts	1,287	0.13
TrendMicro Email Services	1,220	0.12
Intermedia	940	0.09
Network Solutions Email Hosting	904	0.09
Blackboard	902	0.09
Yahoo! Business Email	812	0.08
Google Postini Services	421	0.04
FuseMail	317	0.03
easyDNS Mail	297	0.03
Securence	297	0.03
Migadu	295	0.03
LINE WORKS	272	0.03
Everyone.net	219	0.02
Spam Hero	132	0.01
Diligent	87	0.01
Blackberry Internet Service	70	0.01
Pobox	69	0.01
Sentia	69	0.01
ISPrime	65	0.01
BlueTie	60	0.01
MX-Relay	59	0.01
Synaq	49	0
Apptix	39	0
bexio	39	0
Black Pearl Mail	37	0
Sprint Business	20	0
Anti Spam Engine	10	0
Soverin	9	0
Pantera Tools	7	0
Permido	6	0
Kerjamail	5	0
MD OfficeMail	2	0