MDBDATA

In Exchange Path Exchsrvr\MDBDATA
Step reduce
check disk space on partition at MDBDATA File alive
IF disk space more than MDBdata file Size
Run next step Close All Service Exchange
Backup All file in folder c:\Program Files\Exchsrvr\MDBDATA
Open note pad type command /P and / D(after Run /p)

detail in below

eseutil /p "c:\Program Files\Exchsrvr\MDBDATA\MyData1.edb"
eseutil /p "c:\Program Files\Exchsrvr\MDBDATA\MyData2.edb"

Save file name repiardb.bat At c:\Program Files\Exchsrvr\BIN

And run that file

eseutil /d "c:\Program Files\Exchsrvr\MDBDATA\MyData1.edb"
eseutil /d "c:\Program Files\Exchsrvr\MDBDATA\MyData2.edb"

Save file name Defrag.bat At c:\Program Files\Exchsrvr\BIN

And run that file

Restart and start all service Good luck++