ooo-er, it is a bit OS specific, but if I assume you're using XP is that okay? and is it Outlook or Outlook Express you use? Version would be nice too
A word of caution if this is Outlook Express we are discussing - you MUST make sure that you backup all the OE mail files on the "master" machine BEFORE you map other clients to it. When Outlook Express is pointed to a new Store Location it will attempt to write the existing contents to the new location.
If you map this from another PC/OE client it will overwrite the existing contents
without merging/checking.
If you've backed up the master store you can simply reinstate the master copy and all is well.
If you "forgot" to back it up and mapped both laptops they will obliterate whatever was in the original master data store.
From your descriptions above it sounds like the laptops may only have a subset of the emails with the PC having the "master" version...