Changing the default language and timezone for OWA users in Office 365

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Connect to O365 via Powershell

We will have to define the Language and Timezone first.

 

get-mailbox | Set-MailboxRegionalConfiguration -Language  -TimeZone
Language (Locale)Code
Arabic (Algeria)5121
Arabic (Bahrain)15361
Arabic (Egypt)3073
Arabic (Iraq)2049
Arabic (Jordan)11265
Arabic (Kuwait)13313
Arabic (Lebanon)12289
Arabic (Libya)4097
Arabic (Morocco)6145
Arabic (Oman)8193
Arabic (Qatar)16385
Arabic (Saudi Arabia)1025
Arabic (Syria)10241
Arabic (Tunisia)7169
Arabic (U.A.E.)14337
Arabic (Yemen)9217
Basque1069
Bulgarian1026
Catalan1027
Chinese (Hong Kong S.A.R)3076
Chinese (Macau S.A.R)5124
Chinese (People’s Republic of China)2052
Chinese (Singapore)4100
Chinese (Taiwan)1028
Croatian1050
Czech1029
Danish1030
Dutch (Belgium)2067
Dutch (Netherlands)1043
English (Australia)3081
English (Belize)10249
English (Canada)4105
English (Caribbean)9225
English (Ireland)6153
English (Jamaica)8201
English (New Zealand)5129
English (Republic of the Philippines)13321
English (South Africa)7177
English (Trinidad)11273
English (United Kingdom)2057
English (United States)1033
English (Zimbabwe)12297
Estonian1061
Filipino (Philippines)1124
Finnish1035
French (Belgium)2060
French (Canada)3084
French (France)1036
French (Luxembourg)5132
French (Principality of Monaco)6156
French (Switzerland)4108
German (Austria)3079
German (Germany)1031
German (Liechtenstein)5127
German (Luxembourg)4103
German (Switzerland)2055
Greek1032
Hebrew1037
Hindi1081
Hungarian1038
Icelandic1039
Indonesian1057
Italian (Italy)1040
Italian (Switzerland)2064
Japanese1041
Kazakh1087
Korean1042
Latvian1062
Lithuanian1063
Malay1086
Norwegian (Bokmål)1044
Persian1065
Polish1045
Portuguese (Brazil)1046
Portuguese (Portugal)2070
Romanian1048
Russian1049
Serbian (Cyrillic)3098
Serbian (Latin)2074
Slovak1051
Slovenian1060
Spanish (Argentina)11274
Spanish (Bolivia)16394
Spanish (Chile)13322
Spanish (Colombia)9226
Spanish (Costa Rica)5130
Spanish (Dominican Republic)7178
Spanish (Ecuador)12298
Spanish (El Salvador)17418
Spanish (Guatemala)4106
Spanish (Honduras)18442
Spanish (Mexico)2058
Spanish (Nicaragua)19466
Spanish (Panama)6154
Spanish (Paraguay)15370
Spanish (Peru)10250
Spanish (Puerto Rico)20490
Spanish (International Sort)3082
Spanish (Traditional Sort)1034
Spanish (Uruguay)14346
Spanish (Venezuela)8202
Swedish (Finland)2077
Swedish (Sweden)1053
Thai1054
Turkish1055
Ukrainian1058
Urdu1056
Vietnamese1066

 

For the timezone, select the middle value:

 

IndexName of Time ZoneTime
0Dateline Standard Time(GMT-12:00) International Date Line West
1Samoa Standard Time(GMT-11:00) Midway Island, Samoa
2Hawaiian Standard Time(GMT-10:00) Hawaii
3Alaskan Standard Time(GMT-09:00) Alaska
4Pacific Standard Time(GMT-08:00) Pacific Time (US and Canada); Tijuana
10Mountain Standard Time(GMT-07:00) Mountain Time (US and Canada)
13Mexico Standard Time 2(GMT-07:00) Chihuahua, La Paz, Mazatlan
15U.S. Mountain Standard Time(GMT-07:00) Arizona
20Central Standard Time(GMT-06:00) Central Time (US and Canada
25Canada Central Standard Time(GMT-06:00) Saskatchewan
30Mexico Standard Time(GMT-06:00) Guadalajara, Mexico City, Monterrey
33Central America Standard Time(GMT-06:00) Central America
35Eastern Standard Time(GMT-05:00) Eastern Time (US and Canada)
40U.S. Eastern Standard Time(GMT-05:00) Indiana (East)
45S.A. Pacific Standard Time(GMT-05:00) Bogota, Lima, Quito
50Atlantic Standard Time(GMT-04:00) Atlantic Time (Canada)
55S.A. Western Standard Time(GMT-04:00) Caracas, La Paz
56Pacific S.A. Standard Time(GMT-04:00) Santiago
60Newfoundland and Labrador Standard Time(GMT-03:30) Newfoundland and Labrador
65E. South America Standard Time(GMT-03:00) Brasilia
70S.A. Eastern Standard Time(GMT-03:00) Buenos Aires, Georgetown
73Greenland Standard Time(GMT-03:00) Greenland
75Mid-Atlantic Standard Time(GMT-02:00) Mid-Atlantic
80Azores Standard Time(GMT-01:00) Azores
83Cape Verde Standard Time(GMT-01:00) Cape Verde Islands
85GMT Standard Time(GMT) Greenwich Mean Time: Dublin, Edinburgh, Lisbon, London
90Greenwich Standard Time(GMT) Casablanca, Monrovia
95Central Europe Standard Time(GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague
100Central European Standard Time(GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb
105Romance Standard Time(GMT+01:00) Brussels, Copenhagen, Madrid, Paris
110W. Europe Standard Time(GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna
113W. Central Africa Standard Time(GMT+01:00) West Central Africa
115E. Europe Standard Time(GMT+02:00) Bucharest
120Egypt Standard Time(GMT+02:00) Cairo
125FLE Standard Time(GMT+02:00) Helsinki, Kiev, Riga, Sofia, Tallinn, Vilnius
130GTB Standard Time(GMT+02:00) Athens, Istanbul, Minsk
135Israel Standard Time(GMT+02:00) Jerusalem
140South Africa Standard Time(GMT+02:00) Harare, Pretoria
145Russian Standard Time(GMT+03:00) Moscow, St. Petersburg, Volgograd
150Arab Standard Time(GMT+03:00) Kuwait, Riyadh
155E. Africa Standard Time(GMT+03:00) Nairobi
158Arabic Standard Time(GMT+03:00) Baghdad
160Iran Standard Time(GMT+03:30) Tehran
165Arabian Standard Time(GMT+04:00) Abu Dhabi, Muscat
170Caucasus Standard Time(GMT+04:00) Baku, Tbilisi, Yerevan
175Transitional Islamic State of Afghanistan Standard Time(GMT+04:30) Kabul
180Ekaterinburg Standard Time(GMT+05:00) Ekaterinburg
185West Asia Standard Time(GMT+05:00) Islamabad, Karachi, Tashkent
190India Standard Time(GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi
193Nepal Standard Time(GMT+05:45) Kathmandu
195Central Asia Standard Time(GMT+06:00) Astana, Dhaka
200Sri Lanka Standard Time(GMT+06:00) Sri Jayawardenepura
201N. Central Asia Standard Time(GMT+06:00) Almaty, Novosibirsk
203Myanmar Standard Time(GMT+06:30) Yangon Rangoon
205S.E. Asia Standard Time(GMT+07:00) Bangkok, Hanoi, Jakarta
207North Asia Standard Time(GMT+07:00) Krasnoyarsk
210China Standard Time(GMT+08:00) Beijing, Chongqing, Hong Kong SAR, Urumqi
215Singapore Standard Time(GMT+08:00) Kuala Lumpur, Singapore
220Taipei Standard Time(GMT+08:00) Taipei
225W. Australia Standard Time(GMT+08:00) Perth
227North Asia East Standard Time(GMT+08:00) Irkutsk, Ulaanbaatar
230Korea Standard Time(GMT+09:00) Seoul
235Tokyo Standard Time(GMT+09:00) Osaka, Sapporo, Tokyo
240Yakutsk Standard Time(GMT+09:00) Yakutsk
245A.U.S. Central Standard Time(GMT+09:30) Darwin
250Cen. Australia Standard Time(GMT+09:30) Adelaide
255A.U.S. Eastern Standard Time(GMT+10:00) Canberra, Melbourne, Sydney
260E. Australia Standard Time(GMT+10:00) Brisbane
265Tasmania Standard Time(GMT+10:00) Hobart
270Vladivostok Standard Time(GMT+10:00) Vladivostok
275West Pacific Standard Time(GMT+10:00) Guam, Port Moresby
280Central Pacific Standard Time(GMT+11:00) Magadan, Solomon Islands, New Caledonia
285Fiji Islands Standard Time(GMT+12:00) Fiji Islands, Kamchatka, Marshall Islands
290New Zealand Standard Time(GMT+12:00) Auckland, Wellington
300Tonga Standard Time(GMT+13:00) Nuku’alofa

To apply the desired language and timezone for all the mailboxes on your tenant, use the following syntax:

get-mailbox | Set-MailboxRegionalConfiguration -Language 1033 -TimeZone "S.A. Eastern Standard Time"

 

 

 

 

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