Deleted information from address book

Hi guys. I have a problem. Accidently I delete some important information from my address book, it is connected with my work and I don’t know what to do. Are there anyways to restore all information I deleted? Thanks. Windows 7, Outlook 2010 64 bit

Do you have a backup PST file? If not, there isn't much you can do.

• The following proceedures are valid only for Outlook with Internet Mail Only option. You can determine this by opening Outlook and clicking on Help > About Microsoft Outlook.
• The Personal Folder file (.pst / PST) is the place where Outlook stores its data (when you're using Outlook without Microsoft® Exchange Server). Each Personal Folder file contains all of your Outlook folders, including the Inbox, Calendar, and Contacts. You may have a single .pst file (usually called "Internet Folders" or "Personal Folders" in your Folder List), and you may also have an additional .pst file that you use to archive messages (named "Archive Folders"). By backing up these PST files you will be backing up all your Outlook information . The hard part is locating the files...
• You can find the location of this file by:
1. Right-clicking on the Outlook Today icon found in your Outlook shortcuts, or the Outlook Today icon found in your folder list and then left-click "Properties".
2. Once the Properties dialog box is displayed, click the "Advanced" button.

3. The "Path...", shown below by the red arrow, indicates where your Personal Folder file can be found.

4. Write this path down and navigate to the designated folder (Outlook in this example)

OR
You can search for online for an automatic back up utility such as TK8. This service will allow you to set regular back ups of Outlook.
Or for example https://recoverytoolbox.com/wizard_address_book.html Recovery Toolbox for Address Book

You'll have to restore them from your most recent backup.There are a number of ways to backup Address Book (Time Machine, Export Address Book Archive..., or vCard), so restore them whichever way you backed them up.Once your contacts are back in Address Book, chose Reset Device in iSync to ensure the contacts go from Mac to phone.