i get daily .OST report of users.
right now all 300 users .OST file is being saved on a file server from where the script runs and send the report.
i have been noticing the available size like (outlookE drive ) where ost files are stored is decresing drastically by 5 to 10 gb almost every alternate day
for ex. on 1/1/2019 it was 60 gb free but on 1/5/2019 it is 41gb free, though i see only 1 duplicate ost.
i also compared each ost of user with the previous report, i see very marginal difference in ost file size of users comparing 1/1/2019 to 1/5/2019
so what is causing drastic decrease