1. Close Outlook if it is open
   
   
2. Turn Off Cached Exchange Mode

1. Click Start Menu
2. Control Panel
3. Mail
4. Show Profiles
5. Highlight default profile
6. Click Properties
7. Select Email Accounts
8. Highlight Microsoft Exchange
9. Click Change
10. Uncheck the box that says “Use Cached Exchange Mode”
11. Next
12. Finish

3. Delete OST files from hard drive
   
   

1. Start

2. Search

3. For Files or folders

4. All files and Folders

5. Expand “More Advanced Options”

6. Check the box next to “Search hidden files and folders”

7. Leave the other options at default

8. In the top box for “All or part of the file name”, type in “*.ost”

9. Look in should be “Local Hard Drives”

10. Click Search

11. It’ll find files such as outlook.ost, outlook001.ost, etc.  Select all the files it finds and select delete.  This will delete all the offline emails from your computer, but they are still on the server so you won’t lose anything.

4. Turn On Cached Exchange Mode

1. Open Outlook

2. Tools

3. Email Accounts

4. Select View or change existing e-mail accounts

5. Next

6. With “Microsoft Exchange Server” selected, Click “Change”

7. Check the box for “Use Cached Exchange Mode”

8. Next

9. In the box that pops up, click on OK

10. Click Finish

5. Restart Outlook

Once Outlook is restarted, all of your emails will download to your computer again.  It may take awhile, depending on the number of emails you have.  You can watch the progress in the lower right corner of your Outlook screen… it will show the folders as they update.