If you are filing many messages and notice that it is slow, it could be that your local Outlook has been set to only sync fairly recent emails locally and leave the others on the Exchange server. 


Resolution: To speed things up you can temporarily adjust your outlook settings to sync messages that are much older.


  1. In Outlook select File > Account Settings then Account Settings on the sub-menu.
  2. Select the relevant email account from the list (most people will only have one), and pick Change.
  3. More the slider all the way to the right to download all messages


Once they have synced try batch filing again and you should notice that it is significantly quicker.