Transport Limits

Organization Configuration | Hub Transport | Global Settings tab | Transport Settings| properties | General tab.

Send Connector

Organization Configuration> Hub Transport> Send Connectors section. If you double click on each of your connectors (most of you will probably only have one) you will see a “Maximum Message Size” setting.

Receive Connector

Again in the configuration of each of these connectors you set a “Maximum Message Size” like seen below. The setting is changed at Server Configuration> Hub Transport> Receive Connectors.

Mailbox Limits

To set these using the Exchange console: Recipients | Mailbox -> select mailbox (or select another recipient type such as a contact or mail user from the corresponding node) | properties | Mail Flow Settings tab | Message Size Restrictions.

Routing Limits between 2003 and 2010 Environment

Set-RoutingGroupConnector “CONNECTOR NAME” -MaxMessageSize 50Mb

AD Site Links

Set-ADSiteLink “SITE LINK NAME” -MaxMessageSize 50Mb

OWA Attachment Sizes:  (Note: This must be completed on every CAS server)
Use Notepad to change the maxRequestLength value

1. Find the Outlook Web App Web.config file on the Client Access server. The default location is <drive>\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa.
2. Make a backup copy of the web.config file.
3. Open the original file using an editor such as Notepad. Don’t use Internet Information Services (IIS) Manager to edit the Web.config file.
4. Find maxRequestLength and change it to the value that you want. The value is stored in kilobytes (KB). The default value is 35000. The following example shows the maxRequestLength value in the Web.config file.
<httpRuntime maxRequestLength=”51200″ />
Note: This is 50 MB (1024 X 50)
5. Save and close the file.

EWS Attachment Sizes:  (Note: This must be completed on every CAS server)
1. Find the EWS Web.config file on the Client Access server. The default location is C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\exchweb\ews
2. Make a backup copy of the web.config file.
3. Open the original file using an editor such as Notepad. Don’t use Internet Information Services (IIS) Manager to edit the Web.config file.
4. Find maxRequestLength and change it to the value that you want. The value is stored in kilobytes (KB). The default value is 35000. The following example shows the maxRequestLength value in the Web.config file.
<httpRuntime maxRequestLength=”51200″ />
Note: This is 50 MB (1024 X 50)
5. Save and close the file.
Restart IIS.

ActiveSync Attachment Sizes:  (Note: This must be completed on every CAS server)
1. Find the EWS Web.config file on the Client Access server. The default location is C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Sync
2. Make a backup copy of the web.config file.
3. Open the original file using an editor such as Notepad. Don’t use Internet Information Services (IIS) Manager to edit the Web.config file.
4. Find maxRequestLength and change it to the value that you want. The value is stored in kilobytes (KB). The default value is 35000. The following example shows the maxRequestLength value in the Web.config file.
<httpRuntime maxRequestLength=”51200″ />
Note: This is 50 MB (1024 X 50)
5. Save and close the file.
Restart IIS.