Outlook/Exchange

keep your "internet mail" .pst folder intact and setup outlook for Corporate email. Configure the MS Exchange properties for Corporate email and when you open Outlook. You will have 2 sets of folders. Drag and drop your emails to the Exchange account, then remove the Personal folders file and the Internet mail service.
OR
export the pst file, remove the personal folders file and internet mail account. Configure Outlook for Corporate email and import from the pst file.

It depends on what email client you have in the w/s and also if you have an Exhange server or not.

1) If your client is Windows Messaging, Exchange client or Outlook you certainly have a .pst. If you have an Exchange server all you need is to import the pst file to the mailbox in the exchange server. Then you can access to your email from any w/s in the network provided you setup your email profile, what is a snap.
If you don't have an Exchange server, you can share your .pst file and then setup your profile in the w/s so that your personal folder maps to the share.
You can see where is located your .pst file by looking at Control Panel - Mail - Services tab - Personal folders - properties.

2) If your client is another software like Eudora or Pegasus, you can also share your local mailbox and map to it from another w/s

3) If your client is Outlook Express, tough... you can't.

Regards,