I got the following message form Alpari regarding an upgrade to MT4 (646). I assume this won't affect Zorro performance, right?. Though in my case I will have to upgrade to 646 since I am still runing in 509.

Dear trader,

This weekend we’re upgrading our MT4 live servers to the latest build of MT4 (build 646).

The latest build introduces several new features, including a dynamic built-in search function, MetaQuotes’ new books category, alerts and emails via MQL4 applications to popular email service providers such as Hotmail, and the ability to scale MQL4 dialog windows.

Will the update affect me?

Clients currently using build 600 or higher will not be affected, but we do recommend that you upgrade to the latest build for optimal MT4 performance.

If you are on a build lower than 600, you will need to take a few steps to ensure your Expert Advisors, indicators and other MT4 functions run as normal.