getting different results with dates

m using ms sql server 2005

when i fire query

select * from .............
.......................
.......................
and convert(varchar,login_date,101) = '03/24/2009'

for the dates from '03/24/2009' to 04/10/2009

ie i fire explicit query for each date
and add all the results , then count is 107

but if i fire query

select * from .............
.......................
.......................
and convert(varchar,login_date,101) >= '03/24/2009'
and convert(varchar,login_date,101) <= '04/10/2009'

i get only 41 results

why the two query results differ so much ,
the results should be same

Do you have DISTINCT anywhere in SELECT?.

You are converting date to VARCHAR, you may want to do it other way round, converting literal string to compare with login_date.