Mailbox: Send Queue Size

I have an Exchange 2003 Server on which MOM reported a high Send Queue size. Launched perfmon and monitored the respective counters (MSExchangeIS Mailbox \ Send Queue Size) and noticed that a specific instance is constantly high, increasing slowly by time. All required services running. Checked C:\Program Files\Exchsrv\Mailroot\vsi1\Queue for pending messages but was empty. Mail flow is still occuring successfuly.

Any ideas on what that queue size is refering to?

Thanks
counters.JPG
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noc-mittsAsked:
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noc-mittsAuthor Commented:
Queue went down back to 0 without any intervention ... ExBPA was run multiple times but nothin useful came out. Cause of issue is still unkown.
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