Suddenly Cannot Send Emails with iPhone via Hotmail?

I have had my iPhone for 6 months and used it just fine to send and receive Hotmail and all of a sudden as of yesterday, I can no longer send messages but can still receive them. I get a message that says that a "Copy has been stored in my outbox. Sending message to server failed". I have been on the Internet for 3 hours and tried everything and nothing works. I know it is a Hotmail problem as I can send fine from my Gmail and Yahoo accounts via iPhone.
Any ideas?

Solved thank you! It was in IIS. THe UploadReadAheadSize parameter was limiting to 50k the size of attachments. The fix, for us, to increase attachments size to 20meg is here:
C:\Inetpub\AdminScripts>cscript adsutil.vbs get w3svc/UploadReadAheadSize
Microsoft (R) Windows Script Host Version 5.6
Copyright (C) Microsoft Corporation 1996-2001. All rights reserved.
The parameter "UploadReadAheadSize" is not set at this node.
C:\Inetpub\AdminScripts>cscript adsutil.vbs set w3svc/UploadReadAheadSize "200000
00"
Microsoft (R) Windows Script Host Version 5.6
Copyright (C) Microsoft Corporation 1996-2001. All rights reserved.
UploadReadAheadSize : (INTEGER) 20000000
C:\Inetpub\AdminScripts>
No need to reboot.
References:
http://technet.microsoft.com/en-us/library/cc737382(WS.10).aspx
and http://blogs.technet.com/benw/
and http://discussions.apple.com/thread.jspa?threadID=2064307&tstart=0

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Message was edited by: ethanm

Suddenly Cannot Send Emails with iPhone via Hotmail?

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