Move an Offline Folder file (.ost)
If you work offline with Outlook or use Cached Exchange Mode with Microsoft Exchange Server, you can change the location of the local Offline Folder file (.ost) to a different folder or hard disk drive.
- Exit Outlook.
- Click Start, and then click Control Panel.
- Double-click Mail, and then click E-mail Accounts.
- Click Show Profiles, and then select the profile that contains the .ost file.
- Click Properties, and then click Data Files. (more…)