Is Microsoft 365 or office365.us more popular?

Microsoft 365 is used by more websites in our catalog: 159,483 use Microsoft 365 and 119 use office365.us.

Does Microsoft 365 or office365.us have higher-authority sites?

office365.us sites have the higher median Ahrefs Domain Rating (Microsoft 365: 34, office365.us: 50).

Is Microsoft 365 or office365.us growing faster?

Between 2026-06 and 2026-07, Microsoft 365 went from 21% to 18% of all tracked sites, while office365.us went from 0.02% to 0.01%. office365.us is gaining ground faster in our index.

Can a site use both Microsoft 365 and office365.us?

No. A site runs a single email host, so Microsoft 365 and office365.us are mutually exclusive.

Where does this Microsoft 365 vs office365.us data come from?

Adoption is counted from Site Stats Database's own crawl; Domain Rating comes from Ahrefs and traffic from DataForSEO. Figures reflect the sites we track and refresh at least monthly.

Microsoft 365 vs office365.us — Site Stats Database

Microsoft 365 vs office365.us

A side-by-side comparison of two email hosting providers, based on the 736,999 Email Host sites tracked by Site Stats Database.

Last updated July 1, 2026

Metric	Microsoft 365	office365.us
Websites	159,483	119
Market share	22%	0.02%
Share of top 10K sites	23%	0.02%

Rank	#2	#144

Median DR	34	50

Average DR	36	49

Median keywords	1,062	1,113

Median referring domains	469	872

Median domain age	19 yrs	24 yrs

Average domain age	18 yrs	21 yrs

Average monthly traffic	124,094	134,543

Combined monthly traffic	19,790,892,765	16,010,669

espn.com
LanguageEnglish
DR (Ahrefs)91
Total Keywords4,106,588
Referring Domains255,313
Domain Age31 yrs
Traffic (Jun 2026)1,425,283,167
Traffic Trend
TechnologyMicrosoft 365
mlb.com
LanguageEnglish
DR (Ahrefs)90
Total Keywords1,403,577
Referring Domains165,017
Domain Age31 yrs
Traffic (Jun 2026)376,727,145
Traffic Trend
TechnologyMicrosoft 365
adobe.com
LanguageEnglish
DR (Ahrefs)96
Total Keywords4,590,632
Referring Domains1,640,623
Domain Age39 yrs
Traffic (Jun 2026)293,123,914
Traffic Trend
Technology
healthline.com
LanguageEnglish
DR (Ahrefs)92
Total Keywords7,041,614
Referring Domains458,961
Domain Age21 yrs
Traffic (Jun 2026)220,346,497
Traffic Trend
Technology
microsoft.com
LanguageEnglish
DR (Ahrefs)96
Total Keywords3,038,378
Referring Domains2,803,353
Domain Age35 yrs
Traffic (Jun 2026)168,600,293
Traffic Trend
Technology
ca.gov
LanguageEnglish
DR (Ahrefs)93
Total Keywords3,288,410
Referring Domains475,784
Domain Age28 yrs
Traffic (Jun 2026)136,738,647
Traffic Trend
TechnologyMicrosoft 365
lowes.com
LanguageEnglish
DR (Ahrefs)88
Total Keywords4,826,414
Referring Domains158,334
Domain Age31 yrs
Traffic (Jun 2026)135,785,869
Traffic Trend
Technology
carfax.com
LanguageEnglish
DR (Ahrefs)90
Total Keywords1,945,867
Referring Domains47,295
Domain Age28 yrs
Traffic (Jun 2026)125,863,196
Traffic Trend
Technology
akc.org
LanguageEnglish
DR (Ahrefs)90
Total Keywords655,094
Referring Domains78,973
Domain Age31 yrs
Traffic (Jun 2026)125,727,029
Traffic Trend
TechnologyMicrosoft 365
nps.gov
LanguageEnglish
DR (Ahrefs)92
Total Keywords1,563,784
Referring Domains315,622
Domain Age28 yrs
Traffic (Jun 2026)121,452,048
Traffic Trend
TechnologyMicrosoft 365

Website	Language	DR (Ahrefs)	Total Keywords	Referring Domains	Domain Age	Traffic (Jun 2026)	Traffic Trend	Technology
espn.com	English	91	4,106,588	255,313	31 yrs	1,425,283,167		Microsoft 365

militaryonesource.mil
LanguageEnglish
DR (Ahrefs)83
Total Keywords181,601
Referring Domains20,053
Domain Age
Traffic (Jun 2026)7,947,490
Traffic Trend
Technologyoffice365.us
dni.gov
LanguageEnglish
DR (Ahrefs)83
Total Keywords19,989
Referring Domains30,302
Domain Age21 yrs
Traffic (Jun 2026)1,073,314
Traffic Trend
Technologyoffice365.us
usmc-mccs.org
LanguageEnglish
DR (Ahrefs)74
Total Keywords35,685
Referring Domains6,557
Domain Age26 yrs
Traffic (Jun 2026)938,980
Traffic Trend
Technology
magpul.com
LanguageEnglish
DR (Ahrefs)70
Total Keywords16,248
Referring Domains4,618
Domain Age27 yrs
Traffic (Jun 2026)709,984
Traffic Trend
Technology
geaerospace.com
LanguageEnglish
DR (Ahrefs)77
Total Keywords34,978
Referring Domains9,000
Domain Age14 yrs
Traffic (Jun 2026)416,103
Traffic Trend
Technology
darpa.mil
LanguageEnglish
DR (Ahrefs)83
Total Keywords10,165
Referring Domains30,909
Domain Age
Traffic (Jun 2026)370,029
Traffic Trend
Technologyoffice365.us
bellflight.com
LanguageEnglish
DR (Ahrefs)74
Total Keywords7,351
Referring Domains5,379
Domain Age8 yrs
Traffic (Jun 2026)339,471
Traffic Trend
Technology
edmundoptics.com
LanguageEnglish
DR (Ahrefs)71
Total Keywords17,802
Referring Domains7,537
Domain Age26 yrs
Traffic (Jun 2026)323,504
Traffic Trend
Technology
anduril.com
LanguageEnglish
DR (Ahrefs)75
Total Keywords16,018
Referring Domains6,887
Domain Age22 yrs
Traffic (Jun 2026)293,324
Traffic Trend
Technology
mustangsurvival.com
LanguageEnglish
DR (Ahrefs)64
Total Keywords4,593
Referring Domains1,930
Domain Age31 yrs
Traffic (Jun 2026)255,542
Traffic Trend
Technology