Office 365 Hybrid mode office 2010 Pro Plus users were working but periodically get "unlicensed"

Please why some users MS Outlook 2010 displays (unlicensed product), they cannot reply and forward emails and cannot use Excel and Word ??  They were working and are licensed for Office 2010 Pro Plus through an EA with Office 365 but periodically are running into this.
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Vasil Michev (MVP)Commented:
Office 365 Pro plus checks for activation every 30 days. Make sure the user ID you used to activate it has a valid Office Pro Plus license and also that you are not blocking the connection to Office servers:

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