You may experience loss of performance or functionality in Microsoft Exchange. These symptoms may occur because of file damage or after you install a new program.

Note that in this article the term "Microsoft Exchange" applies to both Microsoft Exchange and Microsoft Windows Messaging.

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This behavior can occur if a Microsoft Exchange file has been replaced or damaged.

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Move all .pst and .pab files into another folder then uninstall Microsoft Exchange. To uninstall Microsoft Exchange, follow these steps:

1.	Click Start, point to Settings, and then click Control Panel.
2.	Double-click Add/Remove Programs.
3.	Click the Windows Setup tab.
4.	Click the Microsoft Exchange check box to clear it.
5.	Click OK.
6.	Reinstall Microsoft Exchange. To reinstall Microsoft Exchange, repeat the above steps, but select the Microsoft Exchange check box in step 4.

If you still experience a loss of performance or functionality, follow these steps:

1.	Uninstall Microsoft Exchange using the above steps.
2.	Double-click the My Computer icon on the desktop.
3.	Double-click drive C.
4.	Double-click the Program Files folder.
5.	Double-click the Microsoft Exchange folder.
6.	On the Edit menu, click Select All.
7.	On the File menu, click Delete.
8.	If there is a Windows Messaging folder, repeat steps 1-7, but double- click the Windows Messaging folder in step 5.
9.	Reinstall Microsoft Exchange, creating new .PST and .PAB files. To reinstall Microsoft Exchange, follow these steps: a. Click Start, point to Settings, and then click Control Panel. b. Double-click Add/Remove Programs. c. Click the Windows Setup tab. d. Click the Microsoft Exchange check box to select it. e. Click OK.
10.	Test for functionality and performance. If it is acceptable, create a new profile with the original .pst and .pab files.

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