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Slow public folder replication between exchange 2007 and 2010

Posted on 2014-12-08
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Last Modified: 2015-02-07
Public folder replication interval is set at 1 minute. We are migrating from exchange 2007 to 2010 and so have users on both environments.

Replication from exchange 2010 to 2007 takes 1 minute.
Replication from exchange 2007 to 2010 takes 15 minutes.

As the messages are delivered to mail enabled public folders in 2007 and then replicated across, this is an issue.

I have used powershell and checked the replicationinterval for all databases is set correctly. I have also reduced the message size limit to 100kb.

Is there any way to speed this up and or monitor what the problem may be?

The servers are at different sites but operate over a high speed WAN link.

Cheers.
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Question by:tegenius
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Expert Comment

by:ThaVWMan
ID: 40486760
A couple of things I have found on this.... You said you reduced the message size limit to 100kb.... from what I have found, it looks like to "speed up" replication, you should increase this, not decrease it.  Also, I take it from your original post that you set the replication interval to "always", but did you set the replication message priority?  If not, try setting that to urgent.

https://social.technet.microsoft.com/Forums/en-US/b8f883a1-80df-43b4-9cef-7c101e8e03f9/exchange-2003-2007-how-to-speed-up-public-folder-replication?forum=exchangesvrdeploylegacy

I am guessing that in 2010 a lot of these settings have been tweaked for better speed, hence why messages coming from there are fast.
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Author Comment

by:tegenius
ID: 40486814
Cheers. I have increased the size limit to 2000kb but the same problem exists. The 2007 environment is on SP3 but no rollups have been installed.

The 15 minute replication delay is specific to the 2007 >2010 direction.
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Author Comment

by:tegenius
ID: 40486816
As for replication message priority, where is this set? I am struggling to find documentation on where to change this. Cheers.
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Expert Comment

by:ThaVWMan
ID: 40486857
Hmm, that may have been an Exchange 2003 only setting... as I cannot seem to find any info on the priority  setting for 2007 either.

Another thought that came to mind, and it may be completely wrong, but for some reason I thought exchange used some settings stored in AD Sites and Services....  I am pulling from way back, but wasnt the default site replication period every 15 minutes?  You mentioned that they were in different sites, it would be worth it to check and test changing the 2007 site to 2010 site AD replication interval....
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Expert Comment

by:dsnegi_25dec
ID: 40487191
Any event viewer

try below command

Resume-PublicFolderReplication
 Get-PublicFolderStatistics -ResultSize Unlimited | Update-PublicFolder -Server [destination server]
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Accepted Solution

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tegenius earned 0 total points
ID: 40557519
I escalated this to Microsoft and actually it is a product limitation. If mail is being transported via exchange 2007, the replication interval can never be less than 15 minutes. On exchange 2010 there is a workaround but only if mail is being delivered to 2010 first before being routed.
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Author Closing Comment

by:tegenius
ID: 40595439
Product limitation identified by microsoft support.
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