Mysterious "Over you quota limits" in Exchange 2010. Any ideas on why users are getting these message if Quota has not been met?

Mysterious "Over you quota limits" in Exchange 2010. Any ideas on why users are getting these message if Quota has not been met? End users are getting over the limit errors in outlook even though the minimum level (quota) has not even been met yet. (IE Warnings for reaching 310 mb for example when the warning quota is set to 400mb).
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Thomas Zucker-ScharffSolution GuideCommented:
That is a classic phishing scheme.  Are they phishing emails or real ones?
William FulksSystems Analyst & WebmasterCommented:
How close are they to the warning level? Could be something hung up in Exchange that may be pushing it over the limit, like a large outgoing or incoming message. A screenshot of the error would help, too.
MacleanSystem EngineerCommented:
Did you make 100% sure that none of the users have a quota applied at either mailbox or mailstore level?
One usually will find that if the message is legitimate, it would be coming from the back-end exchange.
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HariomExchange ExpertsCommented:
1) First Check the Quota Limit on Exchange Database using following powershell command

Get-MailboxDatabase | fl IssueWarnningQuota,ProhibitSendQuota,ProhibitSendReceiveQuota

2) Check Mailbox Quotas Per User using following powershell command

Get-Mailbox -Identity "server_support" |fl IssueWarnningQuota,ProhibitSendQuota,ProhibitSendReceiveQuota

3) Use PowerShell to see which user has exceeds the quota limit

Get-MailboxStatistics -Database MDB01 | ? {$_.StorageLimitStatus -eq “IssueWarning” -OR $_.StorageLimitStatus -eq “ProhibitSend” -OR $_.StorageLimitStatus -eq “ProhibitSendReceive”} | Select DisplayName, Alias, StorageLimitStatus

4) Use PowerShell to see which users received a quota message:

Get-TransportServer | Get-MessageTrackingLog -ResultSize Unlimited -MessageSubject “your mailbox is” –EventID DELIVER | Select TimeStamp, Recipients, MessageSubject

Using above powershell command you will be able to find the root cause.

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admitechAuthor Commented:
apparently this was client side (outlook) issue
admitechAuthor Commented:
Didn't really identify the issue but is a PowerShell List of command to keep in the toolbox! Thanks
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