Accidents happen. If you mistakenly deleted all your Exchange contacts in your phone or JabloTool, you can still recover them from Outlook. See the detailed guide for Outlook 2013 below. You will open the folder with deleted items, change view settings to have all deleted contacts together and move them back to Contacts folder.
Open the Deleted items folder.
Click the tiny arrow to open View properities and choose view by Type and Show in Groups.
For Outlook 2010 click the Arrange by: field to open View properities and choose view by Type and Show in Groups.
Scroll to Contacts directly or click triangles on the left of each group to close it and leave only Contact open.