Exchange 2010: Wrong quota warnings


in this SBS2011 installation with very few users, quotas are disabled.  If I ask powershell for active quota, I get:

[PS] C:\Windows\system32>Get-Mailbox username| fl *Quota

ProhibitSendQuota            : unlimited
ProhibitSendReceiveQuota     : unlimited
RecoverableItemsQuota        : unlimited
RecoverableItemsWarningQuota : unlimited
IssueWarningQuota            : unlimited
RulesQuota                   : 64 KB (65,536 bytes)
ArchiveQuota                 : unlimited
ArchiveWarningQuota          : unlimited

Still the user daily receives notification, that his mailbox is almost full.
Database quota are also disabled.

Where to look?
Ralph ScharpingDigital TherapistAsked:
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mbkitmgrConnect With a Mentor Commented:
You probably already know this but in case you are having one of those days ... has the server been restarted.  Changes to quotas on certain levels need certain services to be restarted
AmitIT ArchitectCommented:
You can set quota limit at user and db level. Check both.
Ralph ScharpingDigital TherapistAuthor Commented:
I did.  It's not set - as I said.
Ralph ScharpingDigital TherapistAuthor Commented:
I restarted all kinds of services - everything that I see has "Exchange" in the name or is associated with Exchange (like IIS), but no changes.  This is REALLY strange.
Ralph ScharpingDigital TherapistAuthor Commented:
Somehow the issue disappeard after several days and reboots.
Never found out what excactly caused it.
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