The first thing to do is to see if your WM5 device has a backup option onboard. I can't know all models but many had a backup to SD CARD feature. Use that first then EXPLORE WHAT settings you used in ActiveSync for the sync.
I have an XDA Argon running WM5. It has on it all my contacts, calendar etc. plus lots of Excel, Notes and other files. It used to synchronise with my notebook PC, but now whenever I connect it to the notebook either the notebook overwrites the data in the mobile, or vice versa. I have not therefore dared to synchonise it for over a year now, so both devices now have a lot of differences. Also I suspect the root of the problem is that somehow the timestamps (or whatever Mobile Device Center uses to control its sync process) have got messed up.
How do I, without risk of losing any data either in my mobile or in my notebook, get the two re-synchronised?
Either I need to back up both sets of data to somewhere I can restore from before trying to sync, or I need a sync process that will never delete or overwrite anything without asking for permission first. So far I've failed to find either solution. I can back up the files from the mobile to an SD card, but I can't find out how to back up the calendar and contacts. Is there a web service that will do it (without connecting to the PC)? Or can I create a new Outlook account and copy the mobile items to it in some way (without the risk that the PC writes the empty Outlook account into the mobile thus deleting everything)?
Hope someone can suggest a safe way out of this mess...
Thanks - Rowan