Outlook 2003 Startup errors

[Howard]

At Startup, (a Message)

You are using an Old OST file, delete this and clost down mail. Then start
Outlook again, a new OST file will be created.

Problem: There are 4 OST files, which OST file to delete?

Thank You,

Howard Miller
(e-mail address removed)

 

[Brian Tillman]

You are using an Old OST file, delete this and clost down mail. Then
start Outlook again, a new OST file will be created.

Problem: There are 4 OST files, which OST file to delete?

Delete them all.