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Andy Jenkins, … Mihai Niță Ⓤ8

Jul 7

Building icu4c on Windows - TestMessageFormat2 fails with U_FILE_ACCESS_ERROR

Thank you very much Andrew! This might help us make a more informed decision. So at least in your

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Building icu4c on Windows - TestMessageFormat2 fails with U_FILE_ACCESS_ERROR

Thank you very much Andrew! This might help us make a more informed decision. So at least in your

Jul 7

Issei Ikejiri, … Markus Scherer7

Jul 6

Question on Character Conversion Behavior (ICU 3.2 vs 7.8)

Hi markus, Thank you for the explanation. If we have additional questions, we will ask you again.

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Question on Character Conversion Behavior (ICU 3.2 vs 7.8)

Hi markus, Thank you for the explanation. If we have additional questions, we will ask you again.

Jul 6

Jun 1

Notice: change in rule status of line breaks at the end of text

Dear ICU team & users, Since ICU 2.8, the implementation of line breaking in ICU has reported

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Notice: change in rule status of line breaks at the end of text

Dear ICU team & users, Since ICU 2.8, the implementation of line breaking in ICU has reported

Jun 1

Oliver Ford, … Steven Loomis6

Apr 13

Jira - unable to raise issue

Atlassian Jira's bug affects people who already have other permissions somewhere else (such as,

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Jira - unable to raise issue

Atlassian Jira's bug affects people who already have other permissions somewhere else (such as,

Apr 13

Mar 17

ICU 78.3 Released — and future changes

Dear friends and users of ICU, We are pleased to announce the release of Unicode® ICU 78.3. This is a

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ICU 78.3 Released — and future changes

Dear friends and users of ICU, We are pleased to announce the release of Unicode® ICU 78.3. This is a

Mar 17

Bineet Singh, Markus Scherer3

Mar 17

Concurrency issue in ICU4J ResourceBundleWrapper

Thanks Markus. Using the link, I am able to raise bugs. Though jabagawee kindly added the fix for

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Concurrency issue in ICU4J ResourceBundleWrapper

Thanks Markus. Using the link, I am able to raise bugs. Though jabagawee kindly added the fix for

Mar 17

TAMURA, Kent, … Mark Davis Ⓤ13

Mar 10

Korean AM/PM symbols not localized in ICU 78 (ICU-23332)

Thanks for the analysis and followup On Tue, Mar 10, 2026 at 2:35 PM Annemarie Apple <annemarie@

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Korean AM/PM symbols not localized in ICU 78 (ICU-23332)

Thanks for the analysis and followup On Tue, Mar 10, 2026 at 2:35 PM Annemarie Apple <annemarie@

Mar 10

Feb 23

Unexplained behavior related to converters

Hello, My program uses "ucnv_setDefaultName" which doesn't set the desired default

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Unexplained behavior related to converters

Hello, My program uses "ucnv_setDefaultName" which doesn't set the desired default

Feb 23

Feb 20

Contributing a C++ modules API for ICU

Hi, I would like to submit a proposal to add a C++ modules API for ICU. This wouldn't introduce

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Contributing a C++ modules API for ICU

Hi, I would like to submit a proposal to add a C++ modules API for ICU. This wouldn't introduce

Feb 20

Alexander Turenko, … Markus Scherer3

Feb 16

[C++ API] Should StringSearch constructor accept RuleBasedCollator as const?

On Mon, Feb 16, 2026 at 7:15 AM Steven Loomis <srlo...@unicode.org> wrote: Collators cannot be

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[C++ API] Should StringSearch constructor accept RuleBasedCollator as const?

On Mon, Feb 16, 2026 at 7:15 AM Steven Loomis <srlo...@unicode.org> wrote: Collators cannot be

Feb 16

Feb 2

ICU 78.2 Released -- and future changes

Dear clients and friends of ICU— The ICU 78.2 maintenance release has been released. This includes

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ICU 78.2 Released -- and future changes

Dear clients and friends of ICU— The ICU 78.2 maintenance release has been released. This includes

Feb 2

Feb 2

ICU 78.2 Released — and future changes

Dear clients and friends of ICU— The ICU 78.2 maintenance release has been released. This includes

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ICU 78.2 Released — and future changes

Dear clients and friends of ICU— The ICU 78.2 maintenance release has been released. This includes

Feb 2

Matt Magoffin, … Markus Scherer4

Jan 27

Collation with upper and numeric comparing in unexpected way

Thank you Rich and Markus, I missed the part in the docs that mention numericOrdering is a primary

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Collation with upper and numeric comparing in unexpected way

Thank you Rich and Markus, I missed the part in the docs that mention numericOrdering is a primary

Jan 27

Vaishnav Katiyar

Jan 27

Inquiry: Security Hardening in IANA tz Database 2025c and ICU Build Tools

Dear ICU Team, I wanted to bring to your attention the recent security hardening introduced in the

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Inquiry: Security Hardening in IANA tz Database 2025c and ICU Build Tools

Dear ICU Team, I wanted to bring to your attention the recent security hardening introduced in the

Jan 27

Franka Reuter, George Rhoten3

Jan 19

Question to https://unicode-org.atlassian.net/browse/ICU-22887

Thanks George Regards Franka On Tuesday, 20 January 2026 at 8:20:39 am UTC+8 George Rhoten wrote:

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Question to https://unicode-org.atlassian.net/browse/ICU-22887

Thanks George Regards Franka On Tuesday, 20 January 2026 at 8:20:39 am UTC+8 George Rhoten wrote:

Jan 19

Raj Aryan, Shane Carr2

Jan 19

Request for JIRA Access - New Contributor

Hi Raj, Thanks for your interest in Unicode! You should be able to create your own Jira account; I

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Request for JIRA Access - New Contributor

Hi Raj, Thanks for your interest in Unicode! You should be able to create your own Jira account; I

Jan 19

Amit Patil, … Ramesh Rajbanshi3

12/31/25

Request to Join as a Contributor to the ICU Project

On Tuesday, October 28, 2025 at 12:38:02 AM UTC+4 Elango Cheran wrote: ICU is an open source project,

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Request to Join as a Contributor to the ICU Project

On Tuesday, October 28, 2025 at 12:38:02 AM UTC+4 Elango Cheran wrote: ICU is an open source project,

12/31/25

Mike Samuel, … Elango Cheran9

12/23/25

Explore a cross-PL implementation of ICU

Yep, that URL is the Kalai Github repo. We ditched the single pass strategy early on, so you won'

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Explore a cross-PL implementation of ICU

Yep, that URL is the Kalai Github repo. We ditched the single pass strategy early on, so you won'

12/23/25

12/19/25

upcoming ICU 78.2 maintenance release

Dear friends and users of ICU, We have assembled a small number of C++ bug fixes on the ICU 78

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upcoming ICU 78.2 maintenance release

Dear friends and users of ICU, We have assembled a small number of C++ bug fixes on the ICU 78

12/19/25

Vaishnav Katiyar, … Markus Scherer4

12/18/25

operator+ ambiguity with std::wstring on Windows

On Wed, Dec 17, 2025 at 4:46 PM Robin Leroy <eggr...@unicode.org> wrote: Le mar. 16 déc. 2025

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operator+ ambiguity with std::wstring on Windows

On Wed, Dec 17, 2025 at 4:46 PM Robin Leroy <eggr...@unicode.org> wrote: Le mar. 16 déc. 2025

12/18/25

Vaishnav Katiyar, Markus Scherer2

12/12/25

Clarification on CVE-2025-5222 Fix in ICU

On Fri, Dec 12, 2025 at 4:18 AM 'Vaishnav Katiyar' via icu-support <icu-support@unicode.

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Clarification on CVE-2025-5222 Fix in ICU

On Fri, Dec 12, 2025 at 4:18 AM 'Vaishnav Katiyar' via icu-support <icu-support@unicode.

12/12/25

Christian Maurer, Fredrik Roubert3

12/12/25

ICU 78.1: C4275 in GregorianCalendar and NumberFormat

Hi Frederik, Sorry for the delay! I found this stackoverflow entry: https://stackoverflow.com/

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ICU 78.1: C4275 in GregorianCalendar and NumberFormat

Hi Frederik, Sorry for the delay! I found this stackoverflow entry: https://stackoverflow.com/

12/12/25

Benjamin Gilbert, Fredrik Roubert2

12/10/25

icu4c 78.1: attribute 'dllexport' cannot be applied to a deleted function

On Sat, Dec 6, 2025 at 5:11 AM Benjamin Gilbert <bgil...@backtick.net> wrote: > icu4c 78.1

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icu4c 78.1: attribute 'dllexport' cannot be applied to a deleted function

On Sat, Dec 6, 2025 at 5:11 AM Benjamin Gilbert <bgil...@backtick.net> wrote: > icu4c 78.1

12/10/25

Biedrzycki, Filip, Markus Scherer2

11/25/25

Question about CVE-2025-5222

On Tue, Nov 25, 2025 at 7:46 AM 'Biedrzycki, Filip' via icu-support <icu-support@unicode.

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Question about CVE-2025-5222

On Tue, Nov 25, 2025 at 7:46 AM 'Biedrzycki, Filip' via icu-support <icu-support@unicode.

11/25/25

Christian Maurer, … Steven Loomis5

11/25/25

icupkg: string storage overflow

Hi Markus, the build finished successfully when using #define STRING_STORE_SIZE 300000 I will run

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icupkg: string storage overflow

Hi Markus, the build finished successfully when using #define STRING_STORE_SIZE 300000 I will run

11/25/25

David Ritter, George Rhoten3

11/19/25

ICU 78 genrb failure on Solaris x86

Oh cool. I have applied the patch from the PR and it does address the runtime error I observed on

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ICU 78 genrb failure on Solaris x86

Oh cool. I have applied the patch from the PR and it does address the runtime error I observed on

11/19/25

11/17/25

Can not log into ICU JIRA page

Hello! I'm attempting to submit a few bugs for ICU 78 and I have been unable to log into the

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Can not log into ICU JIRA page

Hello! I'm attempting to submit a few bugs for ICU 78 and I have been unable to log into the

11/17/25

11/2/25

Help Needed: genrb.exe Not Found Due to Misaligned Build Paths

Dear ICU Support Team, I'm building ICU4C version 77.1 on Windows using Visual Studio 2022, and I

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Help Needed: genrb.exe Not Found Due to Misaligned Build Paths

Dear ICU Support Team, I'm building ICU4C version 77.1 on Windows using Visual Studio 2022, and I

11/2/25

10/30/25

ICU 78 Released

Dear friends and users of ICU, We are pleased to announce the release of Unicode® ICU 78. It updates

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ICU 78 Released

Dear friends and users of ICU, We are pleased to announce the release of Unicode® ICU 78. It updates

10/30/25

10/13/25

Confusing stop position on error in ucnv_convertEx()

Hi, For context, I am working on a programming language's runtime system to add support for ICU

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Confusing stop position on error in ucnv_convertEx()

Hi, For context, I am working on a programming language's runtime system to add support for ICU

10/13/25

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