MFCMAPI October 2026 (26.0.26291.01)

build: 26.0.26291.01

DARK MODE (CTRL+SHIFT+D or Options Dialog)

If you just want to run mfcmapi or mrmapi, get the executables (exe). if you want to debug them, get the symbol files (pdb).

the 64 bit builds will only work on a machine with 64 bit outlook installed. all other machines should use the 32 bit builds, regardless of the operating system.

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Changes:

• #1016: Add configurable dark mode support and improve UI elements
• #1015: Bump EnricoMi/publish-unit-test-result-action from 2.24.0 to 2.25.0 in the production-dependencies group
• #1013: Bump ossf/scorecard-action from 2.4.4 to 2.5.0 in the production-dependencies group across 1 directory
• #1014: U/sgriffin/refine addin loading
• #1012: U/sgriffin/pin wingetcreate version
• #1011: Verify CodeQL bundle integrity before installation
• #1010: Bump the production-dependencies group with 6 updates
• #1009: Bump step-security/harden-runner from 2.21.1 to 2.22.0 in the production-dependencies group
• #1007: Bump brace-expansion from 1.1.18 to 1.1.21
• #1008: Bump the production-dependencies group with 3 updates

See More

• #1006: Bump the production-dependencies group with 3 updates
• #1005: Bump the production-dependencies group with 3 updates
• #1004: Bump step-security/harden-runner from 2.21.0 to 2.21.1 in the production-dependencies group
• #1003: Bump the production-dependencies group with 3 updates
• #1002: Bump brace-expansion from 1.1.12 to 1.1.18
• #1001: Bump the production-dependencies group with 3 updates
• #1000: Bump the production-dependencies group with 4 updates
• #999: Bump the production-dependencies group with 4 updates
• #998: Bump the production-dependencies group with 3 updates
• #997: Bump the production-dependencies group with 3 updates
• #995: Bump ossf/scorecard-action from 2.4.3 to 2.4.4 in the production-dependencies group
• #994: Bump the production-dependencies group with 3 updates
• #993: Bump the production-dependencies group with 3 updates
• #992: Bump actions/checkout from 7.0.0 to 7.0.1 in the production-dependencies group
• #991: Bump the production-dependencies group with 3 updates
• #990: Fix clang-format failure in dumpStore message export path
• #989: Bump the production-dependencies group with 4 updates
• #988: Group updates
• #980: Fix allocation cleanup in FreeDialogResult
• #979: Bump actions/checkout from 6.0.3 to 7.0.0
• #977: Bump EnricoMi/publish-unit-test-result-action from 2.23.0 to 2.24.0
• #974: Fix XML message export and gate legacy EML option behind a setting
• #975: Fix ARM64EC build failures: LNK4279 POINT icall thunk mismatch with MFC
• #972: Bump actions/checkout from 6.0.2 to 6.0.3
• #973: Bump github/codeql-action from 4.36.0 to 4.36.2
• #970: Bump github/codeql-action from 4.35.5 to 4.36.0
• #969: Bump step-security/harden-runner from 2.19.3 to 2.19.4
• #967: Bump step-security/harden-runner from 2.19.2 to 2.19.3
• #968: Bump github/codeql-action from 4.35.4 to 4.35.5
• #966: Bump step-security/harden-runner from 2.19.1 to 2.19.2
• #965: Refactor binary value conversion and update mapistub submodule
• #964: Bump actions/dependency-review-action from 4.9.0 to 5.0.0
• #963: Bump github/codeql-action from 4.35.3 to 4.35.4
• #962: Bump step-security/harden-runner from 2.19.0 to 2.19.1
• #961: Bump github/codeql-action from 4.35.2 to 4.35.3
• #959: Bump step-security/harden-runner from 2.18.0 to 2.19.0
• #956: Bump step-security/harden-runner from 2.17.0 to 2.18.0
• #957: Bump github/codeql-action from 4.35.1 to 4.35.2
• #955: Bump actions/upload-artifact from 7.0.0 to 7.0.1
• #954: Bump step-security/harden-runner from 2.16.1 to 2.17.0
• #953: Bump step-security/harden-runner from 2.16.0 to 2.16.1
• #952: Bump github/codeql-action from 4.34.1 to 4.35.1
• #951: Bump github/codeql-action from 4.33.0 to 4.34.1
• #949: Bump github/codeql-action from 4.32.6 to 4.33.0
• #948: Bump step-security/harden-runner from 2.15.1 to 2.16.0
• #947: Bump actions/download-artifact from 8.0.0 to 8.0.1
• #946: Bump actions/upload-artifact from 6.0.0 to 7.0.0
• #945: Bump github/codeql-action from 4.32.5 to 4.32.6
• #929: U/sgriffin/vs2026
• #942: Bump actions/dependency-review-action from 4.8.3 to 4.9.0
• #941: Bump github/codeql-action from 4.32.4 to 4.32.5
• #940: Bump minimatch from 3.1.2 to 3.1.5
• #938: Bump actions/upload-artifact from 6.0.0 to 7.0.0
• #939: Bump actions/download-artifact from 7.0.0 to 8.0.0
• #937: Bump step-security/harden-runner from 2.14.2 to 2.15.0
• #936: Bump EnricoMi/publish-unit-test-result-action from 2.22.0 to 2.23.0
• #935: Bump actions/dependency-review-action from 4.8.2 to 4.8.3
• #934: Bump github/codeql-action from 4.32.2 to 4.32.4
• #931: Bump step-security/harden-runner from 2.14.1 to 2.14.2
• #928: Bump github/codeql-action from 4.32.1 to 4.32.2
• #927: Bump github/codeql-action from 4.32.0 to 4.32.1
• #926: U/sgriffin/nuget
• #922: Bump github/codeql-action from 4.31.11 to 4.32.0
• #923: Bump step-security/harden-runner from 2.14.0 to 2.14.1
• #924: remove redundant declarations
• #921: Bump github/codeql-action from 4.31.10 to 4.31.11
• #920: Bump actions/checkout from 6.0.1 to 6.0.2
• #919: Bump github/codeql-action from 4.31.9 to 4.31.10
• #917: Bump github/codeql-action from 4.31.7 to 4.31.9
• #916: Bump actions/upload-artifact from 5.0.0 to 6.0.0
• #915: Bump actions/download-artifact from 6.0.0 to 7.0.0
• #918: Bump EnricoMi/publish-unit-test-result-action from 2.21.0 to 2.22.0
• #913: Bump step-security/harden-runner from 2.13.3 to 2.14.0
• #912: Bump github/codeql-action from 4.31.6 to 4.31.7
• #911: Bump actions/checkout from 6.0.0 to 6.0.1
• #910: Bump step-security/harden-runner from 2.13.2 to 2.13.3
• #909: Bump github/codeql-action from 4.31.4 to 4.31.6
• #907: Bump actions/checkout from 5.0.1 to 6.0.0
• #906: Bump actions/checkout from 5.0.0 to 5.0.1
• #905: Bump github/codeql-action from 4.31.3 to 4.31.4
• #903: Bump actions/dependency-review-action from 4.8.1 to 4.8.2
• #904: Bump github/codeql-action from 4.31.2 to 4.31.3
• #902: Bump step-security/harden-runner from 2.13.1 to 2.13.2
• #901: Bump github/codeql-action from 4.31.0 to 4.31.2
• #899: Bump jidicula/clang-format-action from 4.15.0 to 4.16.0
• #900: Bump EnricoMi/publish-unit-test-result-action from 2.20.0 to 2.21.0
• #898: Bump actions/download-artifact from 5.0.0 to 6.0.0
• #897: Bump actions/upload-artifact from 4.6.2 to 5.0.0
• #896: Bump github/codeql-action from 4.30.9 to 4.31.0
• #894: Bump github/codeql-action from 4.30.8 to 4.30.9
• #893: Bump actions/dependency-review-action from 4.8.0 to 4.8.1
• #892: Bump github/codeql-action from 4.30.7 to 4.30.8
• #891: Bump github/codeql-action from 3.30.6 to 4.30.7
• #890: Bump github/codeql-action from 3.30.5 to 3.30.6
• #888: Bump ossf/scorecard-action from 2.4.2 to 2.4.3
• #887: Bump github/codeql-action from 3.30.4 to 3.30.5
• #886: Bump actions/dependency-review-action from 4.7.3 to 4.8.0
• #885: Bump github/codeql-action from 3.30.3 to 3.30.4
• #883: Load MAPI When Outlook.exe isn't Present
• #880: Bump github/codeql-action from 3.30.2 to 3.30.3
• #878: Bump step-security/harden-runner from 2.13.0 to 2.13.1
• #877: Bump github/codeql-action from 3.30.1 to 3.30.2
• #876: Bump github/codeql-action from 3.30.0 to 3.30.1
• #875: Bump github/codeql-action from 3.29.11 to 3.30.0
• #874: Bump actions/dependency-review-action from 4.7.2 to 4.7.3
• #873: Bump github/codeql-action from 3.29.10 to 3.29.11
• #872: Bump actions/dependency-review-action from 4.7.1 to 4.7.2
• #871: Bump github/codeql-action from 3.29.8 to 3.29.9
• #870: Bump actions/checkout from 4.2.2 to 5.0.0
• #869: Bump github/codeql-action from 3.29.7 to 3.29.8
• #867: Bump actions/download-artifact from 4.3.0 to 5.0.0
• #866: Bump github/codeql-action from 3.29.4 to 3.29.5
• #865: Bump github/codeql-action from 3.29.0 to 3.29.4
• #862: Bump step-security/harden-runner from 2.12.1 to 2.13.0
• #858: Bump github/codeql-action from 3.28.19 to 3.29.0
• #857: Bump step-security/harden-runner from 2.12.0 to 2.12.1
• #856: Bump github/codeql-action from 3.28.18 to 3.28.19
• #855: Bump ossf/scorecard-action from 2.4.1 to 2.4.2
• #853: Bump EnricoMi/publish-unit-test-result-action from 2.19.0 to 2.20.0
• #852: Bump microsoft/DevSkim-Action from 1.0.15 to 1.0.16
• #851: Bump github/codeql-action from 3.28.17 to 3.28.18
• #850: Bump actions/dependency-review-action from 4.7.0 to 4.7.1
• #849: Bump actions/dependency-review-action from 4.6.0 to 4.7.0
• #848: add owners
• #846: Bump actions/download-artifact from 4.2.1 to 4.3.0
• #847: Bump github/codeql-action from 3.28.13 to 3.28.17
• #844: Bump step-security/harden-runner from 2.11.1 to 2.12.0
• #841: Bump step-security/harden-runner from 2.11.0 to 2.11.1
• #839: Bump actions/dependency-review-action from 4.5.0 to 4.6.0
• #838: Bump EnricoMi/publish-unit-test-result-action from 2.18.0 to 2.19.0
• #840: change to latest
• #837: Bump github/codeql-action from 3.28.12 to 3.28.13
• #836: Bump actions/upload-artifact from 4.6.1 to 4.6.2
• #835: Bump jidicula/clang-format-action from 4.14.0 to 4.15.0
• #834: Bump actions/download-artifact from 4.2.0 to 4.2.1
• #833: Bump github/codeql-action from 3.28.11 to 3.28.12
• #832: Bump actions/download-artifact from 4.1.9 to 4.2.0
• #830: Bump github/codeql-action from 3.28.10 to 3.28.11
• #828: Bump actions/download-artifact from 4.1.8 to 4.1.9
• #827: Bump actions/upload-artifact from 4.6.0 to 4.6.1
• #825: Bump ossf/scorecard-action from 2.4.0 to 2.4.1
• #826: Bump github/codeql-action from 3.28.9 to 3.28.10
• #824: Bump step-security/harden-runner from 2.10.4 to 2.11.0
• #822: Bump github/codeql-action from 3.28.8 to 3.28.9
• #821: Bump microsoft/DevSkim-Action from 1.0.14 to 1.0.15
• #820: Bump github/codeql-action from 3.28.7 to 3.28.8
• #819: Bump github/codeql-action from 3.28.6 to 3.28.7
• #818: Bump github/codeql-action from 3.28.5 to 3.28.6
• #817: Bump github/codeql-action from 3.28.2 to 3.28.5
• #815: Bump github/codeql-action from 3.28.1 to 3.28.2
• #812: Bump step-security/harden-runner from 2.10.3 to 2.10.4
• #814: U/sgriffin/test
• #813: Fix ConversationIndex parsing
• #809: Bump step-security/harden-runner from 2.10.2 to 2.10.3
• #810: Bump github/codeql-action from 3.28.0 to 3.28.1
• #808: Bump actions/upload-artifact from 4.5.0 to 4.6.0
• #811: U/sgriffin/sid
• #807: U/sgriffin/test
• #805: U/sgriffin/fuzz
• #804: Add fuzzing
• #802: U/sgriffin/winget
• #798: Bump github/codeql-action from 3.27.9 to 3.28.0
• #801: [StepSecurity] ci: Harden GitHub Actions
• #799: U/sgriffin/winget
• #796: Bump actions/upload-artifact from 4.4.3 to 4.5.0
• #794: Bump github/codeql-action from 3.27.7 to 3.27.9
• #792: Bump github/codeql-action from 3.27.6 to 3.27.7
• #790: Bump github/codeql-action from 3.27.5 to 3.27.6
• #789: Bump jidicula/clang-format-action from 4.13.0 to 4.14.0
• #787: update scorecard url
• #786: Bump actions/dependency-review-action from 4.4.0 to 4.5.0
• #785: Bump github/codeql-action from 3.27.4 to 3.27.5
• #784: Bump step-security/harden-runner from 2.10.1 to 2.10.2
• #783: [StepSecurity] Apply security best practices
• #782: Bump github/codeql-action from 3.27.3 to 3.27.4
• #780: U/sgriffin/codeql
• #781: Bump github/codeql-action from 3.27.2 to 3.27.3
• #779: Bump github/codeql-action from 3.27.1 to 3.27.2
• #777: Bump github/codeql-action from 3.27.0 to 3.27.1
• #776: Bump actions/dependency-review-action from 4.3.4 to 4.4.0
• #774: Bump actions/checkout from 4.2.1 to 4.2.2
• #773: Bump EnricoMi/publish-unit-test-result-action from 2.17.1 to 2.18.0
• #771: Bump github/codeql-action from 3.26.13 to 3.27.0
• #770: Bump github/codeql-action from 3.26.9 to 3.26.13
• #766: Bump actions/checkout from 4.2.0 to 4.2.1
• #769: Bump actions/upload-artifact from 4.4.0 to 4.4.3
• #762: Bump actions/checkout from 4.1.7 to 4.2.0
• #760: Bump github/codeql-action from 3.26.8 to 3.26.9
• #758: Bump github/codeql-action from 3.26.7 to 3.26.8
• #757: Bump github/codeql-action from 3.26.5 to 3.26.7
• #755: Bump EnricoMi/publish-unit-test-result-action from 2.17.0 to 2.17.1
• #756: Bump step-security/harden-runner from 2.9.1 to 2.10.1
• #754: Bump actions/upload-artifact from 4.3.6 to 4.4.0
• #752: Bump github/codeql-action from 3.26.4 to 3.26.5
• #751: Bump github/codeql-action from 3.26.3 to 3.26.4
• #750: Bump github/codeql-action from 3.26.2 to 3.26.3
• #748: Bump actions/upload-artifact from 4.3.3 to 4.3.6
• #747: Bump github/codeql-action from 3.26.0 to 3.26.2
• #746: [StepSecurity] ci: Harden GitHub Actions
• #745: Bump step-security/harden-runner from 2.9.0 to 2.9.1
• #744: Bump github/codeql-action from 3.25.15 to 3.26.0
• #743: Bump github/codeql-action from 3.25.12 to 3.25.15
• #742: Bump ossf/scorecard-action from 2.3.3 to 2.4.0
• #740: Bump step-security/harden-runner from 2.8.1 to 2.9.0
• #738: U/sgriffin/hash
• #736: Bump github/codeql-action from 3.25.11 to 3.25.12
• #735: Bump actions/dependency-review-action from 4.3.3 to 4.3.4
• #733: Bump EnricoMi/publish-unit-test-result-action from 2.16.1 to 2.17.0
• #732: Bump github/codeql-action from 3.25.10 to 3.25.11
• #730: Bump github/codeql-action from 3.25.8 to 3.25.10
• #731: clang formatting changes
• #729: Bump actions/checkout from 4.1.6 to 4.1.7
• #726: Bump step-security/harden-runner from 2.8.0 to 2.8.1
• #725: Bump actions/dependency-review-action from 4.3.2 to 4.3.3
• #727: U/sgriffin/test
• #724: Bump github/codeql-action from 3.25.7 to 3.25.8
• #723: Bump github/codeql-action from 3.25.6 to 3.25.7
• #722: U/sgriffin/2602
• #720: Bump step-security/harden-runner from 2.7.1 to 2.8.0
• #718: Bump github/codeql-action from 3.25.5 to 3.25.6
• #717: Bump actions/checkout from 4.1.5 to 4.1.6
• #716: Bump github/codeql-action from 3.25.4 to 3.25.5
• #715: Bump ossf/scorecard-action from 2.3.1 to 2.3.3
• #714: Bump github/codeql-action from 3.25.3 to 3.25.4
• #713: Bump actions/checkout from 4.1.4 to 4.1.5
• #712: Bump step-security/harden-runner from 2.7.0 to 2.7.1
• #711: Bump actions/dependency-review-action from 4.3.1 to 4.3.2
• #710: Bump actions/dependency-review-action from 4.2.5 to 4.3.1
• #709: Bump github/codeql-action from 3.25.2 to 3.25.3
• #708: Bump actions/checkout from 4.1.3 to 4.1.4
• #707: Bump github/codeql-action from 3.25.1 to 3.25.2
• #706: Bump actions/upload-artifact from 4.3.2 to 4.3.3
• #704: Bump actions/checkout from 4.1.2 to 4.1.3
• #703: Remove dead pipelines, update md
• #702: Bump actions/upload-artifact from 4.3.1 to 4.3.2
• #701: Bump github/codeql-action from 3.25.0 to 3.25.1
• #700: Bump github/codeql-action from 3.24.10 to 3.25.0
• #698: Bump github/codeql-action from 3.24.9 to 3.24.10
• #697: Bump actions/dependency-review-action from 4.2.4 to 4.2.5

This list of changes was auto generated.