Windows Offline Files Synchronization Issue

In my client desktop (XP), I found some error and warning messages during system log-off.
The error messages are :-
1. Files of this type cannot be made available offline.
2. Unable to made archive1.PST file available offline

Then, I verified and reinitialized the CSC (Client Side caching) database files by the following procedure.

1. In Folder Options, on the Offline Files tab, press CTRL+SHIFT, and then click Delete Files. The following message appears:
The Offline Files cache on the local computer will be re-initialized. Any changes that have not been synchronized with computers on the network will be lost. Any files or folders made available offline will no longer be available offline. A computer restart is required.

Do you wish to re-initialize the cache?

2. Click Yes two times to restart the computer.

After I created a new offline CSC database and start synchronization.
Issue Solved !!