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How to create a Service Account with full access to all mailboxes on Exchange Server 2007 mailboxstore?

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We can use following Exchange PowerShell cmdlet to grant a Service Account full access to all the mailboxes on Exchange Server 2007 mailboxstore, but do so only in accordance with your organization's security and privacy policies:

 Get-mailboxserver <servername> | add-adpermission –user <service account> -accessrights GenericRead, 

 GenericWrite -extendedrights Send-As, Receive-As, ms-Exch-Store-Admin

We need to modify <servername> as the Exchange Server name and <service account> as the account for which we would like to grant access.

If you have further questions related to Exchange 2007 Permissions then please refer to

Exchange 2007 Permissions: Frequently Asked Questions

And if you writing a custom application using EWS or Exchange Web Services Managed API for Exchange 2007 then you can also have look at nice post @ Exchange Impersonation vs Delegate Access. which explain difference between Exchange Impersonation and  Delegate Access to access an Exchange mailbox using Exchange Web Services.