You can export contacts from your Outlook 365 account, ready to upload into your ActivePipe account.
Here's how:

• In Outlook on a PC, choose File

If your ribbon doesn't have a File option in the top left corner, you're not using Outlook on a PC.
See What version of Outlook do I have? to get to the export instructions for your version of Outlook.

• From the menu choose Open & Export, then Import/Export.

  

• Choose Export to a file.

  

• Choose Comma Separated Values (.csv).

• In the Select folder to export from box, scroll to the top if needed and select the Contacts folder that's under your account*

* This step is key if you are borrowing a friends/colleagues computer.

• Choose Next

• Choose Browse, name your file, and choose OK

  

• Confirm where your new contacts file will be saved on your computer, and choose Next

• Choose Finish to start exporting your contacts immediately. Outlook doesn't display any message when the export process is complete but the Import and Export Progress box goes away.

  

• Locate the new .csv file on your computer and open it with Excel to verify your contacts are there. You'll likely have a lot of empty cells - that's normal.

  

• Generally we recommend closing the file without saving any changes, otherwise the file might get messed up and you won't be able to use it for importing. If that happens you can always run the export process again and create a new file.

  You can use Excel to update the information in your .csv file. For tips about working with a list of contacts in Excel, see Create or edit .csv files.

Source: https://support.office.com/en-gb/article/export-contacts-from-outlook-10f09abd-643c-4495-bb80-543714eca73f