Why not make all the PCs/Laptops "look" at the same set of store folders within Outlook?
Share the folder where OE stores mail on the "main" PC
Map to this share
Tell the "client" laptops to use that as the location of the mail store
Bob's your uncle - all viewing the same data in real time
Downside -- need to have a "master" (probably the PC) on at all required times to share the mail store. Another downside is that ANY client deleting the mail will delete it from all views (no redundant storage)
Other downside - no remote (not on WLAN) use of email for the laptops...
Upside -- quick/neat & consistent
Edit: The above works for Outlook Express
For Outlook, simply use PST files as the store for the main client (probably already is using PST if you are not on an Exchange server) and map the PST file back from the laptops...
Same benefit