yes. The businessobjects separately provided the option of 
get the report data from universe or others(personal data 
option)in the business objects entered wizard. Click or 
Select the others option and it will let u different files 
or extension files. here select .xls file and follow normal 
report style.

Yes, When u get the output of report then use save as .XLS 
 option.

s sure,when we save the perticular report we have a option 
to save in .XLs

Yes, We can take a report on excel in Business Objects,

Process ....

In Desktop Intelligence -> File -> New - Generate a 
standard report -> Begin -> Other -> Personal Data Files -> 
Finish -> format -> xls & select excel file from browse 
option -> If excel file first row contains column name then 
select the check box -> First row contains column names -> 
Run.

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If you want to save a BO report in excel format then, 

After generating a report file -> save -> File name -
> .......  &  save as type -> xls -> Save

in bo xi we can not generate report on personal file .data
source must be universe.but we can save the report as xl
by selecting save as option.