Looks like this is happening to a couple of my users as well on 5.0.9. Can't say if their issue is related to size, but we're getting unexplained timeouts:
Code:
2008-11-20 20:27:13,815 INFO [btpool0-5416] [name=user@domain.com;mid=179;ip=10.80.9.29;ua=Zimbra-ZCO/5.0.2706.9 (5.1.2600 Service Pack 3;; ja-JP);] FileUploadServlet - File upload failed
org.apache.commons.fileupload.FileUploadException: Processing of multipart/form-data request failed. null
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:429)
.... This is happening almost exclusively to my users in Japan, but aside from their location, I can't see any difference between their setup and anyone else's...
-Mike