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If Outlook is stuck in Offline mode, see Work offline in Outlook.
Important: When using Outlook with an Office 365 mailbox, we recommend always using Cached Exchange Mode.
To change whether shared folders or Public Folders are downloaded when Cached Exchange Mode is turned on, do the following: Cached Exchange Mode enables a better experience when you use an Exchange account.
In this mode, a copy of your mailbox is saved on your computer.
This copy provides quick access to your data, and it is frequently updated with the server that runs Microsoft Exchange.
Alternatively, since its cached, your Exchange server is the "master copy"..
Just close outlook, (and communicator if you use it as well) delete the OST file, then re-open.