This article shows how you can migrate your data from Mosets Tree 2.0.x running on Joomla 1.0 to Mosets Tree 2.1.x running Joomla 1.5.

1. On your new Joomla 1.5 site, install the latest version of Mosets Tree 2.1.
2. Remove all jos_mt_* tables from your new site's database. This is to make way for your original data from your existing old site.
3. Move all jos_mt_* tables from old site to new site's database by exporting all Mosets Tree tables (tables that starts with jos_mt_ prefix) from your old site and import it back to your new site's database.
4. If you have images uploaded from your old site, migrate these directories over to your new site:
   /components/com_mtree/img/listings/m/
   /components/com_mtree/img/listings/o/
   /components/com_mtree/img/listings/s/
   /components/com_mtree/img/cats/m/
   /components/com_mtree/img/cats/o/
   /components/com_mtree/img/cats/s/
5. If you have any non-default templates in Mosets Tree, migrate the template directories over to your new site at:
   /components/com_mtree/templates/
   Note: Mosets Tree 2.0.x's template is not compatible with Mosets Tree 2.1. You may need to update your custom template to work with Mosets Tree 2.1.
6. Login to your new site's back-end and go to this URL:
   <yoursite>/administrator/index.php?option=com_mtree&task=upgrade
   This will upgrade your data to be compatible with Mosets Tree 2.1.

That's all to it and you have completed the migration.