[samsara]

Your problem is not quite clear and there are some possible
solutions.
1. You can try 'ActiveSync', its useful for Outlook sync of
both Pocket PC and mobile phones. Install it and select the
options (in your case: files and emails) you want to
synchronize.
(Note: If your system is 'WM5.0+', you may need
'ActiveSync4.0+' for normal sync.)
2. You may meet the data conflict, for example, you changed
your phone number in your mobile but not synchronized and
changed it again in your desktop. Hence it is
difficult for computer to decide which really needs to
store.
To solve this problem you need to set 'conflict rules':
'follow the desktop' or 'follow the device'.
3.I have met the same problem once I used another software
for sync several years ago. I can not remember exactly. But
if there is a option called 'time filter' in your software.
It may cause the failure of sync of latest emails.
Accordingly disabling similar options maybe helpful.