Reset Cache Mode In Microsoft Outlook when using Microsoft Exchange Server

If Microsoft Outlook us running slow, or you are unable to sent or receive e-mail messages, or you get error messages about local cache being different than the server, then the following steps can be performed to rebuild the local cache. The cache being a local copy of your e-mail messages

1. From within Microsoft Outlook, turn Cache Mode off.
   • Click Tools
   • E-mail accounts
   • Select "View or Change" existing e-mail accounts
   • Click Next
   • With "Microsoft Exchange Server" selected, click "Change"
   • Uncheck "Use Cached Exchange Mode"
   • "Next"
   • "OK"
   • "Finish"
2. Close Microsoft Outlook
   • Click File and Exit
3. Delete local OST files from local hard drive
   • Click Start
   • Search
   • For Files and/or folders
   • Expand the "More Advanced Options"
   • Check "Search hidden files and folders"
   • In the "All or Part of the File Name", enter "*.ost" (without quotes)
   • Select "Local Hard Drives"
   • Click Search
   • Once the computer has searched for all the OST files, highlight the files found and delete them. A copy is on the server.
4. Turn Cache mode back on
   • Run Microsoft Outlook
   • Click Tools
   • E-Mail accounts
   • Select "View or change existing e-mail accounts"
   • Next
   • With "Microsoft Exchange Server" selected, click Next.
   • Check "Use Cached Exchange Mode"
   • Next
   • OK
   • Finish
5. Close Microsoft Outlook
   • Click File and Exit
6. Restart Microsoft Outlook

At this stage the cache will be rebuild by downloading all of your e-mails from the Microsoft Exchange server. This can take a while ....