You will need to restart store to see the effect immediately. This will set the maximum message send limit to approximately 50 MB. Where "username" is the mailbox identity. Set-mailbox -id:"username" -MaxSendSize: 50000 Go to Exchange Management Shell, and type the following command: So, for 50MB, X will be approximately 50000. The web.config change is immediate but the MaxSendSize change takes time, due to caching policy (Mailbox cache, DSAccess delays, and replication delays).īy default, web.config under OWA Vdir (Microsoft\Exchange Server\ClientAccess\Owa) will have the following entry (by default, the max request size is approximately 30MB):Ĭhange to where X is the desired value in KBs. Make sure the total upload time will be less than 60 minutes (based on your size and the speed of your network link) Modify the MaxSendSize using either the set-TransportConfig (for all users) or Set-Mailbox for individual users.ģ. So, to summarize, there are two keys to send a large attachment:Ģ. So, if you are trying to upload a 50MB attachment over a 56Kbps link, you will time out and get a HttpWebException (e.g., the max upload is about 25 MB over a 56 Kbps link).
#Microsoft outlook attachment size limit download#
We have a Request timeout of 60 minutes for any attachment upload request or attachment download (in OWA Basic and Premium). One more thing that you need to be aware of (sorry, the list just goes on): Also, the property is stored in AD and subject to replication delays. Once you set either, you need to recycle store or not access the mailbox for about 15-20 minutes (to let store cache expire) in order for the size change to have affect. set-mailbox and set the MaxSendSize (this is in KBs) to 51200 for 50 MB attachments for a specific set of users. set-transportconfig and then set MaxSendSize (this is in KBs) to 51200 for 50 MB attachments. In order to set the value, use the following tasks in the Exchange Management Shell:ġ. if not found as denoted by "unlimited", from Org Container (default read from Org Container).if not found as denoted by "unlimited", Transport Settings Container.First read from Mailbox object of the user itself.You need to increase the MaxSubmitMessageSize which is a readonly Mailbox property (MaxSubmitMessageSize = 0圆66D0003) and this is where we are getting the 10 MB limit from. This could also be decreased to enforce a lower limit.Ģ. It is set to 30 MB by default and needs to be increased in order to send attachments larger than 30 MB. The MaxRequestLength in web.config is an ASP.NET setting that prevents requests larger than a certain length which was added to prevent DOS attacks. You need to set the MaxRequestLength in web.config to a value larger than 50 MB. Depending on your situation, you might want to either increase or decrease this number as we have a mechanism by which you can change the default upload limits of file attachments in OWA.įor example: in order to send attachments which are 50 MB or larger:ġ. If you are an administrator of an Exchange Server of your organization, read on.īy default, Exchange 2007 OWA will let you send attachments of up to 30 MB in size. Now, you might say that sending my baby's video does not exactly constitute the best use of company resources but I can think of a lot of Administrators that might want to have control over attachment size in OWA.
#Microsoft outlook attachment size limit code#
And then I realized - hey, didn't I write some code to prevent such uploads? Darn it - cannot even share my baby's first shower with my mother. And when I tried to upload the video, OWA would not let me do so.
Yesterday afternoon, I was trying to send a large video of my new born baby to my mom through Exchange Server 2007 Outlook Web Access (OWA).
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