Problem: “Contacting the server for information” or “Getting your new Office ready for you” message box prompt for long periods of time while opening up Microsoft Office 365 applications.
Solution 1: Close the Message and Microsoft Office App
Step 1: Press CTRL + SHIFT + ESC key combination to open Task Manager.
Step 2: Select Microsoft Office App that is currently blocked from working because of the message box.
Step 3: Click End Task button at the bottom of the dialog box. Your unsaved data in the app will be lost.
Step 4: Re-open Microsoft Office App.
Solution 2: Disable “Use Office 2016 to sync Office files that I open” Option in OneDrive sync client
For Windows, right click OneDrive icon in the taskbar > Settings > Office > uncheck Use Office 2016 to sync Office files that I open option.
For Mac, click the OneDrive icon in the menu > ellipsis > Preferences > uncheck Use Office 2016 to sync Office files that I open option.
After unchecked this setting, all files will be synced by OneDrive sync client.
Microsoft Answer Community: Contacting the server for information.
Microsoft Office Support: Why am I getting the message “Contacting the server for information”?