Clean up unnecessary space

I am to clean up unnecessary space of Exchange 2010 as the Win 2008 server has only 2.5 Gb left. But I get this now.

C:\Windows\SoftwareDistribution\DataStore>eseutil /MH DataStore.edb

Extensible Storage Engine Utilities for Microsoft(R) Exchange Server
Version 14.01
Copyright (C) Microsoft Corporation. All Rights Reserved.

Initiating FILE DUMP mode...
Error: Access to source database 'DataStore.edb' failed with Jet error -1032.

Operation terminated with error -1032 (JET_errFileAccessDenied, Cannot access file, the file is locked or in use) after 0.31 seconds

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HuaMinChenBusiness AnalystAsked:
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cpmcomputersConnect With a Mentor Commented:
If your overall objective to free up disc space you may also find this useful

Please also be aware that an offline defrag of an exchange database is a very time consuming exercise depending on the spec of the server and size of the database it can take many hours ( best perhaps to do it over a weekend ?)
You need to dismount the store
This means users will not have access to mail during this operation
Until the store is remounted
HuaMinChenBusiness AnalystAuthor Commented:
You need to dismount the store
Can I have more details to this? thanks
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