Miva Merchant, the company behind the popular shopping cart with the same name ("Miva Merchant") released a statement on July 12, 2010 that Miva Merchant v4.x shopping cart will reach EOL (End Of Life) and will *not* be PA-DSS certified or compliant. The only solution recommended by Miva Merchant is to upgrade all v4.x stores to v5.5 PR7 (aka "Wombat") to ensure merchants are running PA-DSS compliant ecommerce platform.
The original statement by Miva Merchant can be accessed online at http://extranet.mivamerchant.com/forums/showthread.php?p=359887
dotCOM host is making available FREE upgrade licenses for all storeowners currently running v4.x stores and who have active (leased) license keys provided by dotCOM host. This means you can upgrade your store to Miva Merchant v5.5 PR7 (aka "Wombat") at no additional cost. Simply open a ticket with dotCOM host at https://www.dotcomhost.com/support and request v5.5 upgrade files to be installed on your domain. You can perform the upgrade at your convenience, or have your developer perform the upgrade, or - dotCOM host can assist you with the upgrade as well. If you need help with the upgrade process, please do not hesitate to contact our sales or support at any time.
Support: https://www.dotcomhost.com/support
Sales: sales@dotcomhost.com
