VMware introduced a new recertification policy at March 10, 2014. If you are VCP-certified you must pass any VCP or higher-level exam within two years of earning their most recent VCP certification.
If you do not certify within 2 years, your certification will be revoked, and you will no longer be entitled to use the certification logo or represent yourself as VMware certified. Your certification will be shown as no longer valid on your MyLearn account. Any employer who contacts us to validate your certification will be informed it is no longer valid.
This blog at vNetWise titled VMware Certification Expirations–Good or Bad? has some links to reactions of other bloggers on the news and shows the uproar in the community. The author also gives his opinion on why this recertification is a good thing.
More info in this VMware post: Recertification Policy: VMware Certified Professional