What if rebuilding the Outlook OST file resolves the 'No Connection' error?

If rebuilding the OST (Offline Storage Table) file fixes the issue, it indicates that the OST file was corrupted. The OST file stores a copy of your mailbox data locally. Corruption can occur due to improper shutdowns or network issues. Rebuilding the OST file creates a fresh, synchronized copy of your mailbox, resolving the connection problems. Be aware that rebuilding can take a significant amount of time.