Jimbo has been updated to be compatible with UBB 6.1.0.3. Goto http://www.qasic.net/ to get it. Furthermore, usage of HTML inside Jimbo has been available since it's inception.
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Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.