Remove taken space in Exchange Database by disabled mail accoutns

Dear Experts, we have several Exchange 2016 servers (VMs) in Vsphere 6.5 environment, but one SAN storage is running out of space.

How can I check whether if we can delete some space in Exchange Database? Due to company policy, we have to keep disabled mailuser for a year; but in urgent they can be deleted.

But I'm not sure to check the space which was taken by those disabled accounts. Can  you please help? many thanks!
DP230Network AdministratorAsked:
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Edward van BiljonMessaging and Collaboration Technical Lead (Exchange MVP)Commented:

You can try defrag to claim back whitespace
DP230Network AdministratorAuthor Commented:
Hi Edward, do you have any reference link for that? Does it require down time in Exchange server?
Jeff GloverSr. Systems AdministratorCommented:
Really, to reclaim whitespace now, it is better to create a new Database and move the users there. To use eseutil commands to reclaim whitespace requires a lot of room to work with.(and I have had mixed results)
   Exchange will increase the size of a database without issue as long as there is disk space available but will not decrease the size of a database. It simply flags unused space in the database as Whitespace that can be reused. This is done automatically. If you have a lot of whitespace in the database, it is better to create a new one and move all the users there, then  move arbitration mailboxes and delete the old database.
 To determine the amount of whitespace, you can use powershell Get-MailboxDatabase "<databasename>" -Status | fl Name,AvailableNewMailboxSpace. this will gvie you a conservative estimate. To get an accurate picture, you would need to dismount the database and use eseutil /ms.

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