Outlook 2007 is limitation of message size, although there is no restriction of message on the Exchange 2003 server.

When one of my users trying to reach a 50 MB file to an e-mail message, Outlook 2007 immediately appears with the following message: the attachment size exceeds the allowable limit.  The user is not even allowed to attach the file such as Outlook it immediately blocked.  We have a 10 MB limit for messages that leave the organization.  This user has attempted to send the file to another Member of our Organization. In Outlook 2003, we are able to send 50 MB files to another without problem. Does anyone have any suggestions? I wonder if there is a setting in Outlook 07 which limits the size of an attachment. The confusing part is that he was not yet able to attach the file.

OS: XP Pro 64-bit
Suite Office 2007
Exchange 2003

Thank you!

Hello

1 you need to set the maxRequestLength value in the web.config file to a value greater than 50 MB. The maxRequestLength value in the web.config file is a parameter ASP.NET prevents applications greater than a certain length that has been added to prevent DOS attacks. He is set to 30 MB by default and must be increased in order to send attachments more than 30 MB. This could also be declined to enforce a lower limit.

2. you need to increase the MaxSubmitMessageSize which is a property of the mailbox of readonly (MaxSubmitMessageSize = 0x666D0003) and this is where we reach the limit of 10 MB.

It is read from the following locations:

  1. First reading of the object the user mailbox
  2. If not found as indicated by "unlimited", Transport Settings Container
  3. If not found as indicated by "unlimited", Org (read default Org container) container

To set the value, use the following tasks in the Exchange Management Shell:

1 set-transportconfig MaxSendSize (this is KBS) and then assign 51200 for 50 MB attachments. This will put it to all users

Or

2 set-mailbox and set the MaxSendSize (this is KBS) to 51 200 for attachments of 50 MB forspecific to a set of users.

Once you set or the other, you must recycle store or not access to the mailbox for 15-20 minutes (to allow to store the cache expire) so that the change in size to have effect. In addition, the property is stored in AD and submitted to replication delays.

One last thing that you should be aware of (sorry, the list will just):

We have a timeout of 60 minutes for any attachment request or download attachment query (in OWA basic and Premium). So if you try to download an attachment 50 MB on a 56 Kbps connection, you will then expire and get a HttpWebException (e.g., the max upload is about 25 MB on a 56 Kbps connection).

So, to sum up, there are two keys to send a large attachment:

1 ASP.NET change web.config settings.

2 modify the MaxSendSize using the set-TransportConfig (for all users) or Set-Mailbox for individual users.

And you must

3 ensure that the total download time will be less than 60 minutes (depending on your size and the speed of your network link)

The web.config change is immediate, but the MaxSendSize change takes time, because of the caching strategy (the letter box, DSAccess deadlines and delays in replication cache).

Examples:

Changes to Web.Config

By default, web.config under OWA virtual directory (Microsoft\Exchange Server\ClientAccess\Owa) will have the following entry (by default, the maximum request size is about 30 MB):

....

Change to where X is the value you want in KBs. 50 MB, X will be of approximately50000

Change the size limit of messages by user

Go in the Exchange Management Shell and type the following command:

Set-mailbox - id: "username" - MaxSendSize:50000

Where "username" is the identity of the mailbox. This will set the limit to send message to about 50 MB. You need to restart the store to see the effect immediately.

Change the size limit for messages of all users

Go in the Exchange Management Shell and type the following command:

-Set-transportconfig MaxSendSize: 50000

This will set the limit to send message to about 50 MB. You need to restart the store to see the effect immediately.

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