nobody had to recover a pst file of 5 gb that now is 0 bytes?

info:
-EXT2 from an external nas.
-2 different pc by outlook connect to the same file ( of course one had to close beforer the second pc could connect )

Try Carving with PhotoRec or try to see if you can undelete it with testdisk , but be sure to use a write blocking method... your mileage will vary. those a re easy enough suggestions without getting to intricate in the recovery,

Are you sure you dont need to take owership of the file?
If your not the owner it would show up as 0 bytes.

It could be that the file got truncated.

If after a scan with a software the result is the same then the problem is serious.

Is there any data in the file when looking at it in hexedit?

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

File header for example.

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well,after r-studio scan i found only 1 file 1,9gb corrupted. fixed with a software, it was recovered to 1,5 GB
still missing a lot of emails!
r-studio found a lot of files without extension.
i recovered all from 5 to 6 gb. opened by winhex i found few header inside of them, typical of pst files (!BDN).
but my software to recover pst files, was not able to fix any of them
do you think i followed the right way?

no data inside, size 0 bytes was correct.
no header in that file.