Outlook 2011 Mac

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We have a client with an Exchange 2003 Server running on Windows 2003 Standard.   Their PCs with Outlook 2003 & 2007 have a 12MB limit on attachments and this works well.   The Outlook 2011 for Mac is by default set to a 2MB attachment limit.   Our MS engineers have attempted to up this limit to 12MB also, but nothing has worked.  We have Google'd the problem, but all of the suggestions have been tried.

Has anybody expanded the file attachment size limit for Outlook 2011 for Mac?   If so, can you give us detailed instructions?    Thanks!
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I am going out on a limb but I think you may have a different problem.

the default file size attachment limit for Outlook for Mac 2011 is 10MB.

Is it possible your Mac user has a physical limitation set on his account that is preventing him from sending a larger file?

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Commented:
Physical limitation on his account?   How would we check?   His Exchange account is identical to all of the others, I believe.

Author

Commented:
OK.  We have new info.  We tried the above fix for Exchange - did not seem to affect the problem.

We verified that if this user logs into OWA, they can send 10MB+ attachments, so its not a user account problem.  We loaded Outlook for Mac 2011 on one of our office Macs, setup this user's account, and got the exact same result - attachments stop after 2-3 MB.  This is on a totally different Mac with a different connection to the Internet.  

The exact behavior is:  Hit send on new message with attachment.   Outlook shows the message in the Outbox, with a progress bar and KB sent.  When the progress bar gets to 2-3 MB (it varies), the message simply stops sending, is removed from the Outbox, and does not appear in Sent items.   It simply stops and gives up.

Any other ideas?

Commented:
I thought Outloook for Mac 2011 only worked with Exchange 2007 or above?

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