Exchange 2007 Back Presure

I am trying to find information concerning the Back Presure - Version buckets. I have looked at but it really does not explain the Version buckets.

Event Type:      Warning
Event Source:      MSExchangeTransport
Event Category:      ResourceManager
Event ID:      15004
Date:            7/7/2009
Time:            1:46:08 PM
User:            N/A
Computer:      HUB-CAS
Resource pressure increased from Normal to Medium.

Resource utilization of the following resources exceed the normal level:
Version buckets = 171 [Medium] [Normal=80 Medium=120 High=200]

Back pressure caused the following components to be disabled:
Inbound mail submission from the Internet
Mail submission from the Pickup directory
Mail submission from the Replay directory
Mail delivery to remote domains

The following resources are in the normal state:
Queue database and disk space ("C:\Program Files\Microsoft\Exchange Server\TransportRoles\data\Queue\mail.que") = 8% [Normal] [Normal=95% Medium=97% High=99%]
Queue database logging disk space ("C:\Program Files\Microsoft\Exchange Server\TransportRoles\data\Queue\") = 8% [Normal] [Normal=95% Medium=97% High=99%]
Private bytes = 7% [Normal] [Normal=71% Medium=73% High=75%]
Physical memory load = 38% [limit is 94% before message dehydration occurs.]

Who is Participating?
Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
This occurs when the drive that the queue is on falls to low disk space.   Move the queue to a drive that has adequate disk space.

How to move:
CispAuthor Commented:
The drive that queue is on has 213gb of free space.
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
This is on the C: drive of server  HUB-CAS?   that is 213GB?
Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
If this is the case then do you have another drive to move it to and then back?

I believe the back pressure on RTM is less than 4GB of space then you will have email flow trouble, with SP1 I believe its 512MB

more references:

CispAuthor Commented:
Unfortunately the server only has a C drive.
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