Troubleshooting done

- Usually outlook case space issue happens if user has local archives, migration to new outlook will cause storage space issue. Outlook size remains same 

- Checked for logs , nothing unusual.

- ran disk space analyzer didn't find anything unusual in size.

- no time machine snapshots found.

- if i initiate indexing in the mac, system data space reduces immediately more than 150 Gb but it increases quickly to around 50 GB within 15 - 20 min.

- if i boot the mac to safe mode, the storage size remains same nothing changes.

- checked launchagents, launch daemons, login items, nothing unusual,

if anyone has faced this issue, let me know