we're currently have some weird issue with our organization's Exchange Server 2010:
Although on the server the attachment size is set to 55000000 bytes in the web.config file for OWA, users cannot attach files larger than approx. 25 MB.
Here's some more details and steps to reproduce (screenshots are in German...)
Open OWA web page
Log on using AD credentials
Click the paperclip icon (add attachment)
A Common Dialog (FileOpenDialog) is shown
Select a large file (approx. 30 MB) to upload and start the upload.
after some seconds, an error message is shown: (English: The action you tried to perform couldn't be completed because there's a configuration problem on the server. If the problem persists, please contact Helpdesk.)
Any ideas, why this message is shown? It doesn't explicitly mention any size limit being exceeded... But strangely, smaller files can be attached without any problem.
Some additional information:
- Upload attachment after above error message
a) Sismiss dialog box and click the paperclip icon once again)
(The German text does not really matter. It more or less explains how to attach a file. The button "Durchsuchen..." ("Browse...") lets the user select a file and the link "Anfügen" ("Attach") attaches that file to the mail.)
c) Now, the file can be uploaded without an error message being shown. (File size: 25 MB)
- Upload an 40 MB ASCII Text file (only characters A-Za-Z)
a) create a new mail
b) click the paperclip icon to attach a file and select a 40 MB ASCII text file.
c) Start the upload.
e) When seeing this error message, it is clear that the attchment size is to high.
--> Why is that message shown here, but not in the 25 MB binary file as mentioned above.
--> The size limitation is set to 55000000, why is then 40 MB shown in the error message?
Did anyone already see a similar behaviour?
Does anyone know how to fix this issue and to be able to upload (binary) files larger than 25 MB?
PS: I asked the same question also on Technet (Technet Link)