First, I generate a task in MS Outlook, sync to the website, sync to the iPhone. The text area of the task is, in this instance, 2,859 characters (spaces not counted). I edit the text on the iPhone and save it and confirm after saving that the edit is still present. After syncing, the edit does not show up in Outlook. Is this a bug or am I surpassing your software's character limit?
Second, assuming I'm no where near your limit, I tried to see if the problem was your website or my 'Outlook--to your website' sync software (Gsyncit). However, I cannot figure out how to open a task on the website?