hi jeffgr.
At first, you should know "XOOPS" means XoopsCube in Japan.
Almost all XOOPS sites for japanese are made by 2.0.x-JP or XoopsCubeLegacy 2.1.x
If you mean "XOOPS" as just xoops.org's version, you can ignore Japanese users.
In Japan, there are quite few sites running xoops.org's version.
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I would like to know where I can find information about Xoops development, activities and the user/developer community in Japan.
http://www.xugj.org/ (users/developpers community. the most active now)
http://xoopscube.jp/ (old but cannot ignore it)
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Perhaps, yes.
"XOOPS" is far the most major CMS in Japan.
Of course, "XOOPS" means the versions from XoopsCube Project
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Is it frequently used in the business or other communities?
Yes.