Microsoft’s SQL Server 2008 R2 will reach the end of its life in July of 2019. The database will no longer receive any updates or security patches from Microsoft after that date.
Burli will also end its support for SQL Server 2008 at the same time. We have no specific reason to think Burli will stop working with SQL Server 2008 on that date, but all new releases and patches from Burli beyond that date will assume at least SQL Server 2012 R2 SP4 and may include commands or functions not supported by the older database. Version 11.x of Burli NE (mid-2018 and later) already requires SQL Server 2012 or higher for exactly that reason.
We recommend SQL Server 2014 or SQL Server 2016 as replacements.
SQL Server 2012 works well with Burli, but we’d recommend using the newer versions (both of which are in active production use with Burli with no known issues) if you have the choice. If you already have a spare SQL Server 2012 R2 license and wish to make use of it, that’s fine; the system will be supported by Microsoft (presuming you’re on Service Pack 4) until mid-2022.