(Recently, users are unable to open other authorized maiboxes in OWA, even, the administrator.)

After installing e2k10 SP2 RU4, users are unable to open additional mailboxes through OWA, if the primary SMTP email address of the additional mailbox is not in the accepted domain list.

Following exception is thrown in the owa window

User host address:
OWA version: 14.2.318.2

Exception type: System.ArgumentNullException
Exception message: Value cannot be null. Parameter name: organizationId

This is due to a design change in Exchange 2010 SP2 RU4.

Add the SMTP Primary Email Domain to the ”Accepted Domain List”

Rollback to RU3

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If you ever wondered how long it takes for your browser to close after opening OWA ( outlook web App) if there is no activity?  here are the measurements.

  • Public 15 minutes
  • Private 8 hours


For whatever reason you may have if you decide to change these default values here is the link how to get the work done. The simplest way to achieve desired goal is using PS. Let’s say we will increase the Public cookie time out settings from 15 minutes to 25 minutes.


set-ItemProperty ‘HKLM:\SYSTEM\CurrentControlSet\Services\MSExchange OWA’ -name PrivateTimeout –value 25 -type dword


copy and paste above PS code into  EMS ( management Shell) , adjust the time as you wish , in this case we are going to set it to “25” minutes….

Cookies to control access

The first time that the user name and password are sent to the Client Access server to authenticate an Outlook Web App session, an encrypted cookie is created that’s used to track user activity. When the user closes the Internet browser or clicks Sign Out to sign out of their Outlook Web App session, the cookie is cleared. The user name and password are sent to the Client Access server only for the initial user sign-in. After the initial sign-in is complete, only the cookie is used for authentication between the client computer and the Client Access server.



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rom Steve Goodman:

Other links:

In Exchange 2010 there is actually somewhere to publish these settings – and once configured your documentation won’t need to be updated if the server details change. You’ll find these settings by logging into OWA, and choosing Options. The link ”Settings for POP, IMAP, and SMTP access…” should be shown on the default ”My Account” page:

By default, nothing will be listed if you click the link:


To configure these links, it’s a fairly straightforward process. Before you begin, you need to know what the settings should be and in the case of the SMTP settings, which receive connector on which Hub Transport this relates to.

First, you configure the Client Access servers for the POP and IMAP settings, using the Set-POPSettings and Set-IMAPSettings cmdlets with the -ExternalConnectionSettings parameter.

For each protocol you specify a colon-separated list of values for the ExternalConnectionSettings. For POP3 with TLS, this might be ”” or POP3 with SSL might be ””. IMAP with TLS might be ”” and IMAP with SSL might be ””.

Here’s a quick example of the commands against my test setup:

Set-POPSettings -ExternalConnectionSettings "" 
Set-IMAPSettings -ExternalConnectionSettings ""

It’s important to remember, you need to run the command on all Client Access servers users will access.

Next, you need to allow the receive connector that you want ”published” to advertise it’s settings. You do this with the Set-ReceiveConnector cmdlet specifying the -AdvertiseClientSettings:$true parameter and value.

In my example, I want to advertise the port 587 ”client” receive connector on my Hub Transport server:

Set-ReceiveConnector -Identity "hubtransport\Client HUBTRANSPORT" -AdvertiseClientSettings:$true

Finally, run iisreset to restart IIS on each Client Access Server, the log back into OWA (well, ECP) and test the ”Settings for POP, IMAP, and SMTP access…”  link again. It should now show the settings specified:

For further reading check out Set-IMAPSettings, Set-POPSettings and Set-ReceiveConnector.

(Just a footnote- thanks to Jag at Microsoft for providing this information)

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Early this year i posted a script for turning the reading pain off and on in OWA 2007 using some EWS proxy code in powershell. The same thing can also be done
using the EWS Managed API as well as other properties in OWA like the single line view which someone asked about this week. So here is a script that can be
used for setting both of these values.

Single Line View property,

Like the reading pain this OWA setting in controlled by a property that is set on each folder

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