There are some enhancements for search engines:
- Meta tags: Example page
- XML Sitemap (with ext. seo_basics)
- Browser title: Example page (with ext. seo_basics)
SEO - Search Engine Optimization
Upgrading TYPO3? No problem.
From its inception TYPO3 has emphasized the importance of stable APIs and full backwards-compatibility. The TYPO3 core team follows a regular release schedule and take great care to ensure easy, non-breaking updates.