Is microtype fully supported now by XeLaTeX? If not, how can I keep myself up-to-date on this argument?
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1There's still some features that are pdftex only, such as kerning. You may check tlcontrib.metatex.org every once in a while for the most recent version. – Nils L Jun 11 '13 at 18:54
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1Does the microtype support depend on the used font in xelatex? – student Jun 12 '13 at 07:51
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@student I don't think so. – Aurelius Jun 13 '13 at 10:35
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The following table from the microtype documentation (page 6) shows which of the micro-typographic features are available for the various engines:

As can be seen in the last line, xetex only supports protrusion.
Some time ago, it was rumoured that font expansion would be added to xetex, too, but it seems that there haven't been any developments in this area (or any, for that matter) recently.
Tracking (aka letterspacing) with xetex can be achieved with fontspec and its LetterSpace font feature option.
To stay up to date it should be sufficient to keep your tex system up to date, and for new microtype versions check the Change history.
Robert
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1not enabled mean that if I say only \usepackage{microtype} that feature will not be enabled right? – Aurelius Jun 13 '13 at 10:33
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1@FormlessCloud exactly, these features are available but not enabled by default -- you have to explicitly ask for them. – Robert Jun 13 '13 at 16:19
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Isn't it possible to use kenring with LuaTeX? Maybe a beta version or forcing it?. If not, how (or other package) can I get kerning with LuaTeX – skan Nov 19 '16 at 17:08
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@Robert When will the "kerning" microtye option be available for LuaTeX. Or how to get the same result with some simple LuaTeX parameter? – skan Nov 04 '17 at 20:37