Internet Explorer 6.0

You can both read and write all languages listed among the language scripts.  Languages not listed there will only be displayed if you associate the Latin based script with a font that contains the necessary glyphs.  Read James Kass's discussion on Plane One characters.

You can both read and write UTF-7 encoded email messages.  Internet Explorer can display UTF-7 encoded web pages if  UTF-7 is specified in the META tag but you cannot manually select UTF-7.

All fully supported except Japanese Shift-JIS, which is read-only in Outlook Express.  You can write Japanese messages in ISO-2022-JP (listed as JIS) or UTF-8.

ISO-8859-1  (Western)
ISO-8859-2  (Central European)
ISO-8859-4  (Baltic)
ISO-8859-5  (Cyrillic)
ISO-8859-6  (Arabic)
ISO-8859-7  (Greek)
ISO-8859-8  (Hebrew)
ISO-8859-9  (Turkish)
ISO-8859-11 (aka. TIS-620: supported as a subset of the Windows Thai codepage)

ISO-8859-3  (Maltese & Esperanto)
ISO-8859-10 (Nordic)
ISO-8859-13 (Windows-like Baltic)
ISO-8859-14 (Celtic)
ISO-8859-15 (Western Extended)
ISO-8859-16 (Romanian)

Use UTF-8 or a Windows codepage instead.

Simplified Chinese HZ is fully supported.

Japanese ISO-2022-JP is fully supported in email but Internet Explorer can only display ISO-2022-JP encoded web pages if  ISO-2022-JP is specified in the META tag.

Korean ISO-2022-KR is read-only in email.  Internet Explorer can only display ISO-2022-KR encoded web pages if  ISO-2022-KR is specified in the META tag.

Simplified Chinese EUC-CN is supported as a subset of  GBK and Korean EUC-KR is supported as a subset of  UHC.  Japanese EUC-JP is read-only.

KOI8-R  (Russian)
KOI8-U  (Ukrainian and Belarusian)