Encounter error with command "New-MailboxFolder" (The specified mailbox doesn't exist)

Question

[Symptom]
======================
Generally, a user can use “New-MailboxFolder” command to create mailbox folder for his own mailbox successfully. See the following example:
The above command creates a new folder named “PersonalFAQ” in the mailbox of Administrator.
However, this command cannot be used to create folders on other user’s mailbox although the full access permission is assigned. See the follow example. (We already granted the full access permission of
test1 user to administrator user)
Just as what the picture shows, an error message will appear:
“The specified mailbox “username” doesn’t exist.”
[Cause Analysis]
=======================================
It’s by default. The “New-MailboxFolder” command cannot be used to create folders for other mailboxes.
[Workarounds]
==============================
1. Use EWS channel to create the folders for other mailboxes.
http://msdn.microsoft.com/en-us/library/office/dn535504(v=exchg.150).aspx#bk_createfolderewsma
2. Use MFCMAPI:
3. PFDAVADMIN (Exchange 2003/2007) or Exfolders (Exchange 2010)
More information:
Creating Folders (Exchange Web Services)
http://msdn.microsoft.com/en-us/library/office/aa563302(v=exchg.140).aspx
New-MailboxFolder
http://technet.microsoft.com/en-us/library/dd335113(v=exchg.150).aspx
Microsoft Exchange Server MAPI Editor
http://www.microsoft.com/en-gb/download/details.aspx?id=2953
Exchange 2010 SP1 (and later) ExFolders
http://gallery.technet.microsoft.com/office/Exchange-2010-SP1-ExFolders-e6bfd405
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Answer 1

Since this issue is related to only one user, this means that the USERPARAMS information for this user is corrupted.
The issue could be resolved by deleting all entries related to this user on this table on the HFM DB.
Kindly open the HFM DB and look for the <application name>_userparams table.
and,
Delete the enteries corresponding to the user.Backup this table prior truncating the table.Please get this operation done by an administrator.
Edited by: user10931567 on 16-Jul-2009 10:03 AM