Hi,
sounds quite strange to me - as already mentioned there are perfectly working installations on MS SQL. CREATE INDEX with WHERE clause (which will create filtered index) supported from SQL Server 2008 onwards, so yes, that can cause problems on very old SQL Server versions (but SQL Server 2005 will go out of support next year anyway).
Are you using full or minimal installer? Full installer will bring SQL Server Native client (if checked during installation). If you have installed SQL Server native client yourself - what version?
Try to run server in console with maximum debug (ensure that you have logging set to file in netxmsd.conf):
netxmsd -D9
and post output here.
Best regards,
Victor
