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Exchange 2003 to 2010 migration, resource booking very slow

We have an Exchange 2003 server and an Exchange 2010 server.  Clients on Exchange 2003 use a mix of Outlook 2003 and 2010.  Clients on Exchange 2010 use only Outlook 2010.

This organisation makes heavy use of resources (meeting rooms).  These mailboxes are all currently homed on the Exchange 2003 server (SV-EXC1).  They are configured as 'auto accept' mailboxes (not custom Exchange event sink).

Both Exchange 2003 (SV-EXC1) and Exchange 2010 (SV-EXC2) have replicas of the free/busy public folders as in the 'code' below.  ("Public Folder Database" is in SV-EXC2).

 
[PS] C:\Windows\system32>get-publicfolder -Identity "\NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY" -Recurse | fl name,Replicas


Name     : SCHEDULE+ FREE BUSY
Replicas : {}

Name     : EX:/O=Eco Recycle/OU=ECO
Replicas : {SV-EXC1\01 - First Storage Group\Public Folder Store (SV-EXC1), Public Folder Database}

Name     : EX:/o=Eco Recycle/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)
Replicas : {SV-EXC1\01 - First Storage Group\Public Folder Store (SV-EXC1), Public Folder Database}

Name     : EX:/O=ECO RECYCLE/OU=EXTERNAL (FYDIBOHF25SPDLT)
Replicas : {SV-EXC1\01 - First Storage Group\Public Folder Store (SV-EXC1), Public Folder Database}

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The problem is that booking a meeting room from Outlook 2010 on Exchange 2010 takes a very long time.  The Outlook 2010 clients are configured with the 'Enable Direct booking=1" registry key.  Sometimes Outlook will freeze for up to 10 minutes while it books a meeting room before responding with "The resources have been successfully booked".

Sometimes, even with "the resources have been successfully booked" message, the resources are not booked properly.  They show up in the meeting organisers calendar, tracking tab as booked but opening the meeting room from another Outlook client does not show the room as booked and other bookings can be made.

I note in the screenshot below of an Outlook 2010 client with a mailbox on Exchange 2010 (SV-EXC2) that it makes many connections, including public folders, to the old Exchange 2003 server (SV-EXC1)
Connection status
I disabled "enable direct booking" as a test with no change.

I have tried turning off cached mode with no change.

Sometimes bookings are instant, sometimes they take a long time.

Clients are both wired and wifi with no change in behaviour.

Resource booking from Outlook 2003 is flawless and works every time.
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wokwon
Asked:
wokwon
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1 Solution
 
Auric1983Commented:
What happens with a resource mailbox hosted on the exchange 2010 server?  
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e_aravindCommented:
what is the response when the OWA-2010 users try to use the same resource-mailboxes? are they working with accepted response time?
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wokwonAuthor Commented:
@ Auric1983
Outlook 2010 books the resource (room) on Exchange 2010 instantly and the 'Accepted' message arrives within ten seconds.
Outlook 2003 books the resource (room) on Exchange 2010 instantly and the 'Accepted' message arrives within ten seconds.  It looks like the freebusy and calendar takes a few minutes to update for bookings from Outlook 2003.


@e_aravind
OWA-2010 does not sucessfully book the resource hosted on exchange 2003.  The dialogs close without errors but the booking is never made.
OWA-2010 books a resource on Exchange 2010 successfully.
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wokwonAuthor Commented:
Ended up completing the migration.  Everyone is on Exchange 2010 now and it all works well.

A further symptom:  Making a booking that includes mailboxes on both servers at once is slow; booking mailboxes on one server at a time is instant.
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wokwonAuthor Commented:
No idea why.
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