When you are using the 64-bit version of Outlook, make sure you download the “MFCMAPI.exe.圆4” version instead. You can download MFCMAPI from its official development website on GitHub. You can do some really great things with it, but you can also easily do large irreversible damage to your mailbox so it is important that you make a backup first and follow the below instructions carefully. MFCMAPI is a low-level editing tool to access your mailbox data. This is because the AutoComplete information is stored as a “hidden message” within your mailbox or pst-file. In order to backup and restore the AutoComplete cache you’ll need to make use of MFCMAPI. This means that when you are using an Exchange or account, you’ll have the same AutoComplete cache on each computer where you are using Outlook or Outlook on the Web (OWA) to access your mailbox.įor POP3 and IMAP accounts, this is not the case as this information isn’t synchronized with the mail server. Since Outlook 2010, the AutoComplete cache is being stored within your mailbox itself and is no longer a separate file. Where is the AutoComplete being cached now and how can I back it up in a way that I can also restore it in the future when needed? Now that I’m on Office 365, I no longer have this file but the AutoComplete feature still works. To disable Cached Exchange Mode, repeat the steps but uncheck 'Use Cached Exchange Mode'.When I was still using Outlook 2007, I could back up my AutoComplete cache by copying the nk2-file and then reuse it on another computer. The default setting is 12 months - change this to your preference. Select the box for Use Cached Exchange Mode.Choose File | Account Settings | Account Settings.If you have Cached Exchange Mode disabled for some reason, you can enable it by following the steps below: Use of Cached Exchange Mode shields the user from network and server connection issues and facilitates switching from online to offline for mobile users.Ĭached Exchange Mode is enabled by default when you configure an Office365 account and is also highly recommended. Most users will find that Cached Exchange Mode performs faster than online mode.

Access to all data is not available until the initial synchronization is complete.

Note: the time required to complete the initial synchronization will depend on the size of your mailbox. This copy provides quick access to your data and is frequently updated with the mail server. A copy of your mailbox and GAL (Global Address List) is cached on your computer.

Cached Exchange Mode can provide you with a better experience when you use Outlook.

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