When purchasing MailEnable, a license is granted for that major version release. i.e. 1.0, 1.2, 1.3, 1.4 - 1.9

For example, purchasing version 1.0 grants a license for that major release (1.x) and any minor upgrades and/or hotfixes. Of course MailEnable will release subsequent major releases with improvements to the product, and the option to upgrade the license to the next major version will be provided at a discounted cost.

As such, there is no "life time" limit stipulated on MailEnable Professional or Enterprise Edition licenses and that is they are licensed to for that version (inclusive of any hotfixes or minor releases) until upgraded (by upgrading, the previous license is expired and the license for the new major version supersedes).

When purchasing MailEnable, two (2) support tokens are included that are intended to be used to assist with installation and configuration of product. These tokens expire after 3 months from the purchase date.  Thereafter, technical support tokens must be purchased.