you will prefer Adhoc Testing in this situation &
compatibility testing for OS & browsers.

hi shyam ok we should go for adhoc testing but how can you 
explain adhoc testing for this case?

In case of lack of time it is always advisable to do Adhoc 
testing or Jump/monkey testing tocheck its stability and 
the main functionalities of an application and ofcourse the 
compatibility testing for OS and browser.

Why iam saying Adhoc is: See if u dont have time to check 
each and every functionality, u will obviously check the 
main functionalities stability and remaining 
functionalities to be tested on fly means just few tests 
here and there to ensure that the system doesnot crash out.

hi,

 i prefere sanity testing .why because bu using we can test 
for the testables like stability,operability,observabality,
maintaince of the particular functionality where it focuses 
on only main functionlities of that os and browsers.

i think we cant go for the adhoc testing beacuse adoch 
testing is totally a unorganized manner of testing to check 
the stamina of the bulid.