Force Archiving on Hosted Exchange (Office 365)

By default Office 365 Hosted Exchange processed Archiving policies only once ever 7 days.

You can force this for any mailbox using Windows PowerShell:

1. Connect Windows PowerShell to your Office 365 account.
2. Run: Start-ManagedFolderAssistant -Identity <mailbox>

Archiving policies for specified mailbox should be executed within few minutes.