Unfortunately, it is going away, and quickly. Maybe it wasn’t too obvious at first, because Microsoft never actually said explicitly that “Classic client is going to be discontinued”, but if you read the latest Statement of Direction for Microsoft Dynamics NAV, it’s there.
Microsoft Dynamics NAV Team Blog has just published a mega-useful post about recommendations for configuring Microsoft SQL Server for optimum Microsoft Dynamics NAV Performance. If you haven’t yet, you should check it here.
The blog post delivers a PDF document summarizing certain important parameters, configuration settings and suggestions for improving and maintaining a speedy SQL Server for your NAV installation. The recommendations have been written for x64 version of SQL Server 2005 SP3, SQL Server 2008 SP1 and SQL Server 2008 R2. The document was compiled by Michael De Voe, a Senior Premier Field Engineer at Microsoft specializing in performance, scalability, infrastructure and high-availability for in NAV and AX.