.. _maint_icu: icu --- Releases are approximately six-monthly to annually. In addition to the general steps, the Windows solution and project files require creating for the supported versions of Visual Studio. - delete :file:`win-vc*.diff` files under :file:`packages/icu/patches` For each Visual Studio version: - unpack the new ICU sources - make a copy of the sources (:file:`icu-nn.orig`) - make a second copy of the source (:file:`icu-nn.vcmm`) - start the Visual Studio application - open :file:`icu-nn.vcmm/source/allinone/allinone.sln`, and allow Visual Studio to upgrade the projects to the current version - save the solution (you must Save As to overwrite the existing solution; Save is insufficient) - create a diff with ``diff -urN icu-nn.orig icu-nn.vcmm > win-vcmm.diff`` - copy the diff to :file:`packages/icu/patches/` - ensure the patch is included in the corresponding :file:`series-vcmm` file