Your server administrator has limited the number of items you can open simultaneously try closing

I receive the following sync error in Outlook 2007 SP2:

Your server administrator has limited the number of items you can open simultaneously. Try closing messages you have opened or removing attachments and images from unsent messages you are composing.

It is stopping me updating another user's calendar, which is open within my Outlook. Change are simply not syncing, either way.

Is there a fix for this, e.g. increasing the number of permitted connections on the Exchange Server? We are using Exchange Server 2007 on a domain.

asked Mar 24, 2010 at 14:23

This is usually caused by creating too many RPC connections to Exchange. Do you have alot of notifications, or reminders open, or not dismissed, as these can create an RPC connection each.

You can disable the session limit by changing the following registry key on the server:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\Disable Session Limit

Set it to 1 to disable. However, you may want to find out the underlying cause as to why you are using up the connections, rather than disabling it, as too many connections will have a performance impact on your exchange server.

answered Mar 24, 2010 at 14:29

Sam CoganSam Cogan

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HopelessN00b

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answered Jul 26, 2012 at 17:06

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How to get this error message in Outlook 365?

Your server administrator has limited the number of items you can open simultaneously. Try closing messages you have opened or removing attachments and images from unsent messages you are composing.

I've created an Outlook plugin and it work just fine on my PC/Exchange account, but on my customer PC it crash with this error.

I'm using some LINQ queries and according to this post I shouldn't. Now I would like to test the fix on my PC before going to my customer, but I cannot find out how to generate this error...

Your server administrator has limited the number of items you can open simultaneously try closing

asked Dec 10, 2019 at 20:10

Turn cached mode off in your Exchange account settings and make sure you are working against a folder with a larger number of messages (> 250, or even thousands).

And yes, do not use LINQ or plain loops against the Items collection - use Items.Find/FindNext or Items.Restrict.

answered Dec 11, 2019 at 2:37

Your server administrator has limited the number of items you can open simultaneously try closing

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Users are getting te following msg:

Your server administrator has limited the number of items you can open simultaneously. Try closing messages you have opened or removing attachments and images from unsent messages you are composing

and in exchange events I see : MAPI session (user) exceeded the maximum of 250 objects of type "objmessage".

I found this

https://www-secure.symantec.com/connect/forums/your-server-administrastor-has-limited-number-items-you-can-open-simultaneously

but the links are broken and they are saying that there is a fix for 9.0.1.

We have version 10.0.4 (clean installation, not upgrade)

Any ideas?

Sarah 

365 – Your server administrator has limited the number of items you can open simultaneously. Try closing messages you have opened or removing attachments and images from unsent messages you are composing.

September 1, 2017Random

Recently had a client with Office 365 trying to Cache a Shared Mailbox. Outlook brought up a load of Sync Errors

Your server administrator has limited the number of items you can open simultaneously. Try closing messages you have opened or removing attachments and images from unsent messages you are composing.

If the server is self hosted you can remove the restriction via  : http://henrysluiman.blogspot.com.au/2013/02/how-to-increase-number-of-open-items.html

Microsoft fix for this is removed the Cache! https://support.microsoft.com/en-us/help/3115602/performance-problems-when-you-try-to-access-folders-in-a-secondary-mai

After rebuilding the OST and Profile and still no luck I started Outlook in Safemode which enabled the downloading of the emails

Once downloaded I could start Outlook Normally and all worked fine

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